Exhibit 99.1

www.advent.energy Updated Investor PresentationAs of October 19, 2020 NEXT GENERATION FUEL CELL TECHNOLOGY

2 This presentation has been prepared by Advent Technologies Inc. (“Advent”) and AMCI Acquisition Corp. (“AMCI”) to assist interested parties in making their own evaluation with respect to the proposed business combination between Advent and AMCI and for no other purpose. The data contained herein is derived from various internal and external sources. Please refer to the merger agreement for the business combination between Advent and AMCI and the filings by AMCI with the United States Securities and Exchange Commission (“SEC”) for the full terms of the transaction. While the information contained in this presentation has been prepared in good faith, neither Advent nor AMCI, nor any of their respective shareholders, directors, officers, agents, employees, affiliates, representatives or advisors, makes any representations or warranties (express or implied) as to, or in relation to, the fairness, accuracy, reliability or completeness of the information in this presentation, and liability therefor is expressly disclaimed. Accordingly, neither Advent nor AMCI, nor any of their respective shareholders, directors, officers, agents, employees, affiliates, representatives or advisors, takes any responsibility for, or will accept any liability, whether direct or indirect, express or implied, contractual, tortious, statutory or otherwise, with respect to the accuracy or completeness of the information in this presentation or for any of the opinions, estimates, projections, forecasts, targets, or prospects contained in this presentation or for any errors, omissions or misstatements or for any loss, howsoever arising from this presentation. The information, opinions, estimates, projections, forecasts, targets, or prospects contained in this presentation are provided as at the date of this presentation and are subject to change without notice.This presentation contains financial information prepared in accordance with U.S. generally accepting accounting principles (“GAAP”) that have been extracted without material adjustment from audited GAAP financial statements and/or extracted or derived from unaudited accounting records that have been used to prepare GAAP financial statements. This presentation also contains certain non-GAAP financial measures which have not been and will not be audited. These non-GAAP financial measures are not recognized measures of financial performance or liquidity under GAAP, but are measures used by Advent’s management to monitor the underlying performance of Advent’s business and operations. These non-GAAP measures may not be indicative of Advent’s historical operating results nor are such measures meant to be predicative of future results. These measures and ratios may not be comparable to those used by other companies under the same or similar names. As such, undue reliance should not be placed on these non-GAAP financial measures. Certain financial information contained herein is unaudited and is based on internal records and/or estimates. This presentation contains certain forward-looking information which may not be included in future public filings or investor guidance. The inclusion of financial information or metrics in this presentation should not be construed as a commitment by Advent or AMCI to provide guidance on such information in the future. The balance sheet and income statement data contained herein is currently subject to audit in accordance with the rules of the Public Company Accounting Oversight Board (“PCAOB”) and may be updated or modified in the final audited financial statements included in the proxy statement with respect to the meeting of AMCI stockholders related to AMCI’s business combination with Advent and the related registration statement on Form S-4.The information contained in this presentation is the property of Advent and AMCI. This presentation may not be copied, published, reproduced or distributed in whole or in part at any time without the prior written consent of Advent and AMCI. The trademarks and trademark symbols used herein are the properties of their respective owners.This presentation does not constitute investment, legal, accounting, regulatory, taxation or other advice, and neither this presentation nor the information in this presentation takes into account the recipient’s investment objectives, or the recipient’s legal, accounting, regulatory, taxation or financial situation or particular needs. In particular, any estimates, projections, forecasts, targets, prospects or opinions contained in this presentation necessarily involve significant elements of subjective judgment, analysis and assumption are based upon the reasonable judgment of Advent and AMCI, subject to change without notice, and each recipient should satisfy itself in relation to such matters. This presentation, the information contained in this presentation or any related oral presentation is for informational purposes only and does not constitute, or form part of, any offer, invitation to sell or issue, or any solicitation of any offer to subscribe for, purchase or otherwise acquire any securities in Advent or AMCI or their respective affiliates, nor shall this presentation, or the fact of its communication, form the basis of, or be relied upon in connection with, or act as any inducement to enter into any contract or commitment whatsoever with respect to such securities. This presentation and the information in this presentation are not directed to, or intended for distribution to or use by, any person or entity that is a citizen or resident located in any locality, state, country or other jurisdiction where such distribution, publication, availability or use would be contrary to law or regulation or which would require registration of licensing within such jurisdiction. This presentation contains financial forecasts with respect to Advent’s estimated future performance. These forecasts have been prepared solely by Advent and have not been diligenced by AMCI. Neither AMCI’s independent auditors nor the independent auditors of Advent audited, reviewed, compiled or performed any procedures with respect to the projections for the purpose of their inclusion in this Investor Presentation and, accordingly, neither of them expressed an opinion or provided any other form of assurance with respect thereto for the purpose of this presentation. None of these forecasts were prepared with a view toward compliance with the published guidelines of the SEC, PCAOB, GAAP or the guidelines established by the American Institute of Certified Public Accountants for preparation and presentation of financial forecasts. These projections should not be relied upon as being necessarily indicative of future results. In this presentation certain of the above-mentioned projected financial information has been included (in each case, with an indication that the information is an estimate and is subject to the qualifications presented herein) for purposes of providing comparisons with historical data. The assumptions and estimates underlying the prospective financial information are inherently uncertain and are subject to a wide variety of significant business, economic and competitive risks and uncertainties that could cause actual results to differ materially from those contained in the prospective financial information. Accordingly, there can be no assurance that the prospective results are indicative of the future performance of Advent or AMCI or that actual results will not differ materially from those presented in the prospective financial information. Inclusion of the prospective financial information in this Investor Presentation should not be regarded as a representation by any person that the results contained in the prospective financial information will be achieved. The financial forecasts reflect assumptions that are subject to change, and there can be no assurance that AMCI’s or Advent’s financial condition or results of operations will be consistent with those set forth in such analyses and forecasts. Disclaimer

3 This presentation contains “forward-looking statements” within the meaning of applicable securities laws, including statements with respect to Advent’s strategies, future opportunities and growth prospects, Advent’s financial statements, as well as other information and statements that are not historical fact. These forward-looking statements regarding future events and the future results of Advent and AMCI are based on current expectations, estimates, forecasts, and projections about the industry in which Advent operates, as well as the beliefs and assumptions of Advent’s management. These forward-looking statements are only predictions and are subject to known and unknown risks, uncertainties, assumptions and other factors beyond Advent’s or AMCI’s control that are difficult to predict because they relate to events and depend on circumstances that will occur in the future. They are neither statements of historical fact nor promises or guarantees of future performance. Therefore, Advent’s actual results may differ materially and adversely from those expressed or implied in any forward-looking statements and Advent therefore cautions against relying on any of these forward-looking statements. Factors that might cause or contribute to such differences include, but are not limited to: economic conditions globally; the impact of competition; political and economic developments in the countries in which Advent operates; regulatory developments in Greece, Europe and internationally; the COVID-19 pandemic; the inability for any reason to close the transactions contemplated by the merger agreement between Advent and AMCI; the inability to recognize the anticipated benefits of the proposed business combination between ACMI and Advent, which may be affected by, among other things, the amount of cash available following any redemptions by AMCI’s stockholders; the ability to meet NASDAQ’s listing standards following the consummation of the proposed business combination; costs related to the proposed business combination; Advent’s ability to manage growth; Advent’s ability to execute its business plans and the timing and costs of these plans; Advent’s estimates of the size of the markets it serves; the rate and degree of market acceptance of Advent’s products; rising costs or pricing pressures adversely affecting Advent’s profitability, including sales and marketing expenses; expectations regarding capacity constraints; potential litigation involving AMCI or Advent; the validity or enforceability of Advent’s intellectual property and Advent’s compliance with the intellectual property rights of third parties; and other risks and uncertainties indicated from time to time in the definitive proxy statement to be delivered to AMCI’s shareholders and related registration statement on Form S-4, including those set forth under “Risk Factors” therein, and other documents filed or to be filed with the SEC by AMCI. Any forward-looking statements made by or on behalf of Advent or AMCI speak only as of the date they are made. Neither Advent nor AMCI undertakes any obligation to update any forward-looking statements to reflect any changes in their respective expectations with regard thereto or any changes in events, conditions or circumstances on which any such statement is based. Accordingly, attendees and recipients should not place undue reliance on forward-looking statements due to their inherent uncertainty. In this presentation, Advent relies on and refers to information and statistics regarding industry data. Advent obtained this information and statistics from third-party sources, including reports by financial data firms and other firms. Advent has supplemented this information where necessary with information from discussions with its own internal estimates, taking into account publicly available information about other industry participants and Advent’s management’s best view as to information that is not publicly available. Such information has not been subject to any independent audit or review. To the extent available, the industry, market and competitive position data contained herein has come from official or third party sources. Third party industry publications, studies and surveys generally state that the data contained therein has been obtained from sources believed to be reliable, but that there is no guarantee of the accuracy or completeness of such data. While Advent reasonably believes that each of these publications, studies and surveys has been prepared by a reputable party, neither Advent nor AMCI nor any of their respective directors, officers, employees, agents, affiliates, advisors or agents, have independently verified the data contained therein. In addition, certain industry, market and competitive position data contained herein come from Advent’s internal research and estimates based on the knowledge and experience of Advent’s management in the markets in which Advent operates. While Advent reasonably believes that such research and estimates are reasonable, they, and their underlying methodology and assumptions, have not been verified by any independent source for accuracy or completeness and are subject to change. Accordingly, reliance should not be placed on any of the industry, market or competitive position data contained in such information and no representation or warranty (express or implied) is given that such data is correct or complete.In connection with the proposed business combination between AMCI and Advent and related transactions, AMCI will file preliminary and definitive proxy statements and a registration statement on Form S-4 with respect to the proposed business combination and related matters with the SEC, and will mail a definitive proxy statement and other relevant documents to its stockholders. Investors and security holders of AMCI are advised to read, when available, the preliminary proxy statement and registration statement, and amendments thereto, and the definitive proxy statement in connection with AMCI’s solicitation of proxies for its stockholders’ meeting to be held to approve the proposed business combination and related matters and the related registration statement because the proxy statements and registration statement will contain important information about the proposed business combination and related transactions and the parties to such arrangements. The definitive proxy statement will be mailed to stockholders of AMCI as of a record date to be established for voting on the proposed business combination and related matters. Stockholders will also be able to obtain copies of the proxy statement, without charge, once available, at the SEC’s website at www.sec.gov or by directing a request to: Investor Relations, AMCI Acquisition Corp., 1501 Ligonier Street, Suite 370, Latrobe, PA 15650.AMCI, Advent, and their respective directors, executive officers and other members of their management and employees, may, under SEC rules, be deemed to be participants in the solicitation of proxies of AMCI’s stockholders in connection with the proposed business combination and related transactions. Information concerning the interests of AMCI’s and Advent’s participants in the solicitation, which may, in some cases, be different than those of AMCI’s and Advent’s equity holders generally, will be available in the proxy statement relating to the proposed business combination and related matters to be filed by AMCI with the SEC.By reading this presentation, you agree to be bound by the limitations set out herein. Any failure to comply with these restrictions may constitute a violation of applicable laws. Disclaimer (continued)

Transaction Summary 4 Vasilis GregoriouFounder & CEO Emory De CastroCTO Nick StampCFO Advent Technologies, Inc. AMCI Acquisition Corp. Bill HunterCEO & President AMCI Acquisition Corp. (“AMCI”) has proposed to enter into a business combination with Advent Technologies, Inc. (“Advent”), an innovation driven fuel cell technology company that is unlocking the Hydrogen EconomyAMCI (NASDAQ:AMCI) is a publicly listed special purpose acquisition company with ~$93 million of cash held in trustAdvent and AMCI are combining to advance the development and manufacturing of Advent’s platform technology that is based on high-temperature proton exchange membranes (HT-PEM)The transaction will fully fund the next phase of Advent’s expansion efforts to respond to significant and immediate market opportunitiesAdvent’s existing shareholders are rolling 100% of their equityIt is anticipated that the post-closing company will retain the Advent name and be listed on NasdaqThe transaction is currently expected to close in Q4 2020 or early 2021 Transaction Structure AMCI & Advent Technologies – An ideal combination to unlock the Hydrogen Economy Transaction implies pro forma enterprise value of $319 million(1)2.6x 2024E Revenue projection of $122.8 million, compared to peer average of 17.9x(2,3)13.4x 2024E EBITDA projection of $23.8 million, compared to peer average of 95.6x(2,3)Existing Advent shareholders will receive 57% of the pro forma equity(4)Pro forma, Advent will have ~$122 million of cash to help realize production ramp up Valuation (1) TEV based on equity value assuming $10/share, and $1.3mm of cash as of 6/30/2020, $120 million of new cash post-close and no debt. (2) Refer to page 36 for peer analysis. (3) Utilizes 2023E multiple for peers when 2024E is not available. (4) Refer to page 35 for additional assumptions.

Investment Highlights Experienced management team delivering breakthrough technology in partnership with world class research centers Advent is the missing puzzle piece to unlocking the Hydrogen Economy with low-cost energy solutions Proven, scalable business model that delivers consistent and recurring revenue, with a ~$100m revenue opportunity per 1GW of demand Solving the range and recharge mobility problems with Li-ion batteries given greater energy storage capability 5 Platform technology provides critical performance benefits for a wide range of end markets, with a total estimated market size of more than 850GW by 2040 Sources: Global Data, Bloomberg New Energy Finance. Developing and manufacturing the critical components for high-growth new energy markets, including transportation, off-grid, aviation and the Hydrogen Economy Low cost, fuel-flexible and resilient fuel cell technology – solving the need for expensive hydrogen infrastructure

1. Company Overview

Pioneering, critical technology for the Hydrogen Economy We Are Advent Next Generation Fuel Cell TechnologyBacked by 50+ international technology and process patentsFuel-flexible, lower cost, longer life – works anywhereSupported by industry leading partners Our Partners Our Markets Fuel cells for EV automotive, aviation and stationary / off-grid applicationsEnergy StorageIoT SensorsHydrogen Production Timing is Now Ramping up of EV automotive sector is inflection point for demand of fuel cellsSuccess of Tesla and others provides high visibility for clean techAdvent’s team is highly skilled in production ramp-up and ready to execute on the growth plan of the company Proven Product Ready for Market AdoptionAdvent’s MEA products are already being used and tested for use by a number of top tier customersHeavy truck users beginning adoption of hydrogen fuel cells to extend EV rangeRoll-to-roll manufacturing process provides for scalable, high margin business 7

Advent Fuel Cell is Flexible Broad market, low infrastructure cost Advent’s fuel-flexible capabilities solve the hydrogen infrastructure problem opening an immediate market opportunity 8 AdventMEA Inside Advent Hydrogen, (green) methanol, natural gas, biofuels, ammonia Now: Multi-fuelInfrastructure available now; can deploy Immediately Future: eFuelszero-emissions hydrogen based liquid fuels Competition LT-PEM Requires 99.99% pure hydrogenInfrastructure Cost 100x higher Hydrogen CFRP Tanks for transport, storage$1.5m+ for new refill stations Marine Aviation: Drones, eVTOLs Electric Vehicles Off-Grid Power Fuel Cell Compressed Hydrogen is problematic for aviation, marine, and off-grid

MEA Application in TransportationAdvent Solves the Range and Recharge Problems 9 Advent provides consumers with the same convenience as a conventional vehicle without the pollution

Solving the Hydrogen Infrastructure Problem Advent’s fuel-flexible capabilities allow for significantly reduced infrastructure requirements and provides energy solutions for billions of people in the developing-world 10 ~$50billion RENEWABLE &LOW-CARBON FUELS Retrofit trucks, tanks and pumps DISTRIBUTION: WHOLESALE TO END-USERS GLOBAL: INFRASTRUCTURE COSTS(1) Hydrogen CFRP Tanks for transport, storage ~$15,000billion Battery Grid upgrades, new charging stations ~$5,000Billion Advent Fuel Cells’ Innovative Capability Sources: Joule, Management Estimates. (1) Estimated upfront infrastructure costs, assuming 200 cars per 1000 people of each type. Methanol and biofuels can use existing infrastructure (with minor modifications) built for incumbent liquid fuels.

Next Generation fuel cell technology that significantly improves the economics of hydrogen power What We DoOur Products High-Temp Fuel Cell Complete Systems Develop, Manufacture & Sell Develop & License Fuel-flexible fuel cells that significantly reduce need for hydrogen infrastructureEnter into joint development programs with partnersIntend to scale-up production for mobility (auto, aviation) and stationary (off-grid, portable, security, charging station) markets Leverage MEA technology with a matched fuel cell and license to system integrators, Tier 1s and OEMsIP in design, cooling, testing and optimization Membrane & Electrode Assembly (“MEA”) MEA is the “heart of the fuel cell”Analogous to Li-ion cell for the battery industry High-Temp PEM Membranes Next generation electricity conducting plastics that can operate at 160+oCSignificantly enhances capabilities and performance of fuel cells and other clean technology systems 11 Advent’s technology is fuel-flexible, lightweight and resilient

Unique Market Position in the Fuel Cell Value Chain Only vertically-integrated supplier of HT-PEMs to fuel cell OEMs and system manufacturers 12 % of fuel cell cost HT-PEM LT-PEM SOFC Membrane MEA manufacture & assembly Fuel cell technologyEngineering/Licensing Fuel cell OEMs, and System Manufacturing 3% 25% 30% 100% Any Fuel, Anywhere Hydrogen Only Stationary Only

Advent’s MEAs are the “heart” of the fuel cell & all electrochemistry applications – analogous to Li-ion cell for battery packs Advent MEAMarket Changing Technology $350b by 2040 Telco, O&G, Mining, CHP powerAPUDefense, security, marine Off-grid Power $1,200bby 2027 Heavy-duty trucksCommercial vehiclesPassenger EVsRange extenders for SUVTaxisCharging stations EV Automotive $27b by 2030 Commercial droneSurveillance/DefenseeVTOLsCommercial aviationZero-emissions flightAuxiliary power Aerospace & Defense $2.3bby 2028 Hydrogen technology & generationElectrolysisPower to gas, power to liquid technology providers Hydrogen Production $4.5b by 2028 Vanadium and Iron flow battery Microgrid, industrial and utility marketsUsed for balancing renewable power demand & supply Energy Storage $1.3b by 2027 Electrochemical sensor for: pollution monitoring, medical, food, consumer apps IoT, Sensors Applications FUEL CELLS OTHER MARKETS Market & Size 13 MEA Membrane Electrode Assembly Advent Inside Sources: Grand View Research, IDTechEx, Markets and Markets, Lux Research, Allied Market Research.

Scale-up fundraising; progressing majorcontracts Consolidating 50+ international patents and $500m+ of technology investments by partners, predecessors and strategic licensing & acquisition agreements Evolution & Innovation 2012 Collaboration with US DoE Los Alamos, Brookhaven labs Incorporate in USASeed Round 2013-2016 Projects with NASA, ESA, DoE R&D 2018-2019 2020 Consolidate membrane technology; BASF license UltraCell renews multi-year supply contract License advanced stack technology from EnerFuel US Navy purchases stacks SAFRAN expands program ESS signs component supply agreement Palcan signs MEA supply agreement Stealth IoT company begins program with Advent EV manufacturerengagement 2003 Development of initial fuel cells Development / Evolution Key Partnerships Market Penetration Beyond Production ramp up and commercialization of products Mass Adoption 14 Advent TPS®introduced

Vancouver-based developer of fuel cells for the Chinese marketApplications in automotive, stationary, off-grid marketsAdvent supplies key component Award-winning Munich-based fuel cell manufacturer. Recently secured EU Horizon 2020 funding approvalSiqens has developed the Ecoport 800 HT-PEM fuel cell for off-grid applications using methanol as the hydrogen carrierAdvent supplies MEAs Proven technology with products already in market World-Class Customer Base International high-technology group with 84,000 employees worldwide; operates in aviation, defense and space marketsAdvent supplies MEAs and collaborates on innovation WE DEVELOP, MANUFACTURE, AND SELL Oregon iron flow battery for off-grid and utility systemsBacked by established cleantech investors including Breakthrough Energy & BASF Ventures Advent supplies component of ESS’s iron flow battery California-based developer of fuel-flexible fuel cells for mobile, portable power solutionsSupplier to the U.S., U.K. and other armiesAdvent supplies MEAs Silicon Valley-based IoT InnovatorDevelops specialized sensors Multi-year collaboration with significant commercial potentialAdvent supplies core component Japanese multinational automotive manufacturerApplications in fuel cell vehiclesAdvent MEAs are tested for next generation vehicles FuelCell Energy, Inc. (NASDAQ: FCEL) is a global leader in delivering clean, efficient, and affordable fuel cell solutions configured for the supply, recovery, and storage of energyAdvent supplies MEAs for tri-generation systems 15 Portable Power Off-Grid Energy Storage Aviation Gas Sensors Off-Grid Auto Power Generation

Fuel Cell Market Opportunity TYPICAL SIZE OF ONE UNIT 1-5kW OFF-GRID, CHPSTATIONARY 250-520GW PASSENGER, COMMERCIAL EV 15-30kW 120-680GW HEAVY-DUTY TRUCKMUNICIPAL BUS 100kW+ 40-100GW EVTOL, COMMERCIAL DRONE, PORTABLE REMOTE POWER 1-30kW ~20GW(1) MARKET SIZE2040 16 Customer’s Power Requirements 1 GW Advent Target Cost per kW (2025) $80/kW MEA Sales Revenue $80M Licensing Fees(2) $16M Total Revenue to Advent Per GW $96M Sources: Global Data, Bloomberg New Energy Finance. (1) Management Estimates. (2) Assumes licensing fees are equal to 5% of customer’s fuel cell sales and 30% of MEA cost. Fuel cells & hydrogen production can be a $50 billion market by 2030 driven by well-established global policy support Advent revenue expected to be ~$100m per GW

Strategic partnerships accelerate product development and reduce customers’ launch timeframes Industry Leading Access and Technology DoE, L’Innovator Program: Partner with top US-labs for next-gen developmentBegan partnership with Los Alamos L’Innovator program in 2019 UltraCell: Licensing agreement since 2016 with leading provider of portable, lightweight fuel cells In-house Expertise: Scale-up expertise – working for and with top chemistry leadersWorking with BASF for 7+ years 17

Advent’s technology is the right choice for mobility and affordable power anywhere Fuel Cell Technology Evolution 18 Fuel-Flexibility (Wide Market Opportunity) Fit for Mobility (Power Density, Heat Management, System Simplicity) Resilience, Durability, Lifetime Affordability (Total Cost of Ownership) Improved Commercial Applications HT-PEM (Competitors) Advent HT-PEM Least Benefit to End User LT-PEM (Competitors) Most Benefit to End User

Proven track-record of technological development and commercialization Leadership & Expertise Vasilis GregoriouFounder & CEO 30+ years of operational and strategy experience in the US and EuropeWorld-renowned renewable energy expertExtensive experience in product development and company managementPh.D. Physical Chemistry, Duke MBA, Northeastern 30+ years experience in corporate and securities law, M&A, VC, corporate finance and IP law 20+ years as a C-Suite Officer in Tech/Marketing (founded start up to AIM & Nasdaq IPOs) Chris KaskavelisCMO Jim CoffeyGeneral Counsel 35+ years of technology commercialization, 25+ years in fuel cellsVolume manufacturing expertDOE Manufacturing AwardBASF Fuel Cell Inc.PEMEAS Inc., and De Nora N.A.E-TEKPh.D. CincinnatiB.S. Duke Emory De CastroCTO 20+ years of financial services experience in energy industry and investment banking rolesPreviously Director, EMEA ECM, MacquarieChartered Accountant, Ernst & Young (2004)BA (Classics) Oxford University Nick StampCFO Nora GourdoupiGM Europe 19+ years experience in fuel cellsCo-inventor of Advent polymerPh.D. University of Patras 25+ years in global investment & corporate bankingCEO in banking and investment managementIn-depth knowledge of energy, commodities & transportationTurnaround & scale up expertHarvard Business School, Erasmus MBA, Piraeus University MSc Harris AntoniouAdvent Board of Directors Bill HunterCEO, AMCI 25+ years of financial services experience, with a focus on the industrial and natural resources sectorsLong track record in battery metals-related investments, including current Board member of American Battery Technology Corp.MBA from DePaul University Note: Additional board members will be added prior to close. 19 23+ years experience in operationsB.B.A. University of Cyprus LLM in Business Law Chara DendiOperations

www.advent.energy 2. Next Generation Fuel Cell

Fuel cells solve for issues that cannot be solved by batteries alone True net-zero (not grid-dependent) with green fuels Next Generation Technology Accelerates Clean Energy Transition 21

Bringing down cost/kW – Advent’s fuel cell technology enables longer-lasting, lower cost, more robust and more powerful fuel cells Advent Fuel Cells Outperform Competition Advent vs incumbent LT-PEM technology Any Fuel, Anywhere Advent technology allows fuel cells to be: Long lasting Degradation is still a problem for fuel cellsAdvent can more than triple lifetime (~10,000 hrs to 10% power loss vs 3,500) Fuel-Flexible Hydrogen infrastructure can be delivered quickly and efficiently with methanol or other hydrogen sources such as biogasImpurities in regular hydrogen such as 10 ppm CO (carbon monoxide) kill a low temperature fuel cell – our materials withstand > 2 % COThe same holds true for air purity; air pollution decreases power in low temperature fuel cells Resilient Reducing humidity and temperature issues increases life and reduces cost, and these units work anywhere in the worldLow temperature cannot run hot and dry – no less than 50% Relative Humidity (RH) and not hotter than 70 °C while our technology runs from 0% RH (Nevada) to 100% (Florida in the summer) High Power At least as powerful as current tech (1,100 mW/cm2 peak power) without the extra weight and volume of complex cooling and water management Cost Competitive Roll-to-roll processing mated to catalyst technology that reduces platinum 8-10 foldSimpler system design and fuel flexibility drop TCO massively 22

Enabling the Hydrogen Economy Cost Increasing Range of Applications Advent Primary Applications HCV, Municipal Bus Transportation Off-Grid Power Generation ~100-700GW ~40-100GW Market Size2040 ~250-500GW 23 Current Future Any Fuel Anywhere Extreme Heat (+55oC) Freezing Temperatures(-20oC) Pollution HighHumidity Hydrogen eFuels Natural Gas Ethanol Ammonia Methanol MEA Membrane Electrode Assembly Sources: Bloomberg New Energy Finance, Global Data. For every GW of market size, Advent has the potential to earn an estimated $100 million by driving down costs and improving capabilities

Advent is winning the race to be the low cost industry provider able to take market share from battery and ICE vehicles Low Cost Drives Adoption Substantial unit cost savings as MEA production builds up due to raw material purchasing efficiency & reduced processing costsProcurement, labor and processing costs all highly competitive due to location of manufacturing Substantial cost savings due to automation of assembly line and advanced MEA product development projectsAutomation of assembly line provides 3x efficiency improvement in direct labor costsAdvent’s advanced MEA will provide the same power output with ~25% of the raw materials Cost Reduction by Scale-up Advent’s Patented Technology Provides for Significant Advantage Relative to Peers Cost($/kW) 2021 24 Cost Reduction through Innovation Competition Advent 2022 2023 2025 2025 Ramp-up of advanced MEA Source: Management estimates. Target: $80/kw

www.advent.energy 3. Beyond Fuel Cells

Vast Market Opportunities Beyond Fuel Cells Energy Storage Green Hydrogen Production: Electrolysis IoT Sensors Description Storage solutions for wind or solar energy (utility, commercial & industrial, off-grid) Green Hydrogen is essential for decarbonization, energy storage, and can be converted to renewable fuel Miniaturized sensors with applications in pollution detection, health screening and eNoses (phones that can “smell”) Advent Competitive Advantages Lower cost (50% lower) and higher power (5-10%)Adaptable to numerous RFB chemistriesAlready commercial and deployed in the market Exceeds DOE goals for H2 productionEliminates platinum on the anodeR&D with key partners for directly using salt water for electrolysis and hydrogen production High-temp Advent Materials are ideal for this applicationMulti-year development and ready for productionKorean and Chinese phone makers poised to implement eNose in 2021 Market Size $4.5 billion by 2028 $2.3 billion by 2028 $1.3 billion by 2027 IoT ElectrochemicalSensors Advent MEA Flow Battery Advent Membrane Water Electrolysis Plant Renewable Power Generation 01 02 03 26 Sources: IDTechEx, Allied Market Research.

www.advent.energy 4. Business Plan

Engineering Fees Prototype Phase:We develop in cooperation with OEM specific prototype fuel cell system for application/market $2m $60m Year 3: 30 MW Year 5:450 MW Year 4: 120 MW Year 6: 750 MW Advent’s business model provides strong customer traction and high revenue visibility Business ModelIllustrative Revenue from Single OEM Early Production Phase:We manufacture MEAs and earn license fees on fuel cell system Mass ProductionWe sell MEAs and earn license fees MEA sales Licensing fees OEM:Fuel cell manufacturer or EV manufacturer Advent:Manufacturer of MEAs& developer of fuel cell systems50+ patents, $500m of IP and partnerships with top US-labs provide for competitive advantage OEM focuses on manufacturing & marketing preparation Mass market scale-up – to 100k+ units $3m $11m $37m MEAs produced by roll-to-roll manufacturing means low-capex, high-margin scalability 28 $0.3 Year 7: 1 GW $1m $4m $13m $2m $39m $7m $72m $12m $96m $16m $80m Year 2 Year 1 MEA sales Licensing fees MEA sales Licensing fees

Advent’s revenue growth is driven by significant power requirements across our target markets Revenue Growth Plan Projected revenue composition by category 2021-2025 ($m) 29

Customer Advent Product Details Multiple OEMs – Fuel Cell EV trucks HT-PEM fuel cells 5,000+ trucks on the road @ 200kW per truck1GW potential opportunity in 2025 Asian fuel cell manufacturer MEA Existing customerMoU in place envisages >5m MEAs in 2023 – 2x forecast MEA production US OEM – portable power MEA (Durability and Temperature Resilience) OEM currently supplies portable power fuel cell units to 4 military units globally, including in the U.S. and U.K.Existing customerProjected revenue opportunity $20m in 2025 from single product only Asia – EV charging stations HT-PEM fuel cells Target 4,500 stations @ 240kW per station = 1.1 GW opportunity US IoT – gas sensor Membranes for heat resistivity Silicon Valley-based US developerOEMs – two global cellphone manufacturersCellphone market opportunity alone represents $25m in 2025 Highly Attractive Pipeline >60% of 2025E MEA sales projected to come from existing 2020 customers 30 Development of Revenue by Source 2025E Select Identified Opportunities $13.0m $254.8m 2021E Grants Existing Customers Grants Existing Customers (MEA & License Fees) New Customers (MEA & License Fees) Engineering Fees (New Customers)

Use of proceeds geared towards Advent’s development program resulting in top-line growth Detailed Use of ProceedsProduct Development Plan Program(1) Total (2021 – 2025) New Production Equipment & Warehousing $52.7m US facility expansion $8.9m Advanced DOE MEA Cost $8.0m Current MEA $0.7m MEA for flight $1.0m MEA assembly automation $12.2m Aeronautical Stacks $10.3m Robotic Stack Assembly $9.8m System Assembly Line $42.8m Printable electronics $7.0m Total $153.4m (1) Includes opex for product development plan. 31 Near-term Funding Requirements ($88.5m)

Made in USAProven innovation with product in market IP STRATEGY Long-Term Partnership with UltraCell as a Platform for Growth Application Advent Inside Advent MEAs pass military grade testsNew Advent materials are game changer for portable power industry Partner Product Portable Power: Military grade, 55W-1kW battery chargers allows long autonomy, 5x weight dropLightweight design and system testing expertise Business Deployed in the US, UK, and two moreImmediate growth opportunityExpand sale/capabilities with Advent capital 01 02 03 04 VisionKnow-how & new team propels aviation/automotive next-generation product 3 Gallons of methanol vs.121 lbs of batteries Battery Charger 32

www.advent.energy Financial Overview Path to Profitability

Summary Financials High growth model offering stable margins whilst enabling pass-through of efficiencies to our end users $m 2020E 2021E 2022E 2023E 2024E 2025E MEAs sold (‘000s) 2 325 788 2,144 6,296 18,354 Capacity (MW) 0.1 11 26 265 779 2,271 Revenue 1.7 13.0 25.6 60.0 122.8 254.8 MEAs 0.8 5.9 12.8 30.3 72.5 187.7 Engineering, License Fees & Grant Income 0.9 7.2 12.8 29.7 50.3 67.1 Cost of Goods Sold (0.4) (8.8) (19.8) (38.7) (76.1) (174.4) Gross Profit 1.3 4.3 5.8 21.3 46.8 80.4 % Margin -- 33% 23% 36% 38% 32% SG&A and Other (2.1) (18.1) (20.4) (22.8) (23.0) (29.5) EBITDA (0.8) (13.8) (14.6) (1.5) 23.8 51.0 % Margin -- -- -- -- 19% 20% 34 2.3GW power capacity projected to be sold in 2025Equates to 10,000 220kW fuel cell EV heavy-duty vehiclesAverage MEA cost/kW to customer in 2025 ~ $80/kW, reducing in line with long-term customer fuel cell cost requirements 10-fold reduction in sales price from 2020-2025 drives market penetration without sacrificing gross margin. This is facilitated by:Unit cost economies of scaleTechnological advancementManufacturing automationProjecting EBITDA positive by 2024

Pro Forma Sources, Uses & Equity Ownership Sources ($m) Shares Issued to Advent Shareholders(1) $250 Estimated SPAC Cash in Trust(2) $93 Potential Financing(3) $45 Total Sources $388 Illustrative Pro Forma Ownership(1,3,7) Uses ($m) Rolled Advent Equity $250 Cash to Balance Sheet to Support Project Development and Working Capital $120 Estimated Fees & Expenses(4) $18 Total Uses $388 Advent to be issued shares of Class A common stock at $10.00/share. Assumes that there is no net debt adjustment.Cash in Trust and Pro Forma Ownership reflect 9.1m shares of Class A common stock outstanding and 5.5m shares of Class B common stock outstanding, which is pro forma for redemption of Class A common stock on October 16, 2020 in connection with the successful extension of AMCI Acquisition Corp.’s initial business combination deadline to February 22, 2021.AMCI is seeking $45m of additional Potential Financing as part of the transaction. Pro Forma Ownership assumes that Potential Financing is in the form of Class A common stock issued at $10.00/share.Estimated Fees & Expenses includes deferred underwriting fees and other expenses.Valuation is based on share price of $10.00 per share for illustrative purposes (the redemption price per share of AMCI Acquisition Corp.’s Class A stock will be higher).Inclusive of $1.3m of Advent net cash as of 6/30/2020 and Cash to Balance Sheet resulting from the transaction.Pro Forma Ownership does not include any warrants which are exercisable at $11.50 per share. There are 22.1m public warrants and 5.9m private warrants outstanding, and 2.0m private warrants will be forfeited as part of the transaction. Does not include any awards reserved under the new equity incentive plan to be adopted by AMCI in connection with the closing. Pro Forma Valuation(5) Share Price ($/share) $10.00 PF Shares Outstanding (mm shares)(1,2,3,7) 44.1 Equity Value ($m) $441 Less: Cash(6) ($m) ($122) Enterprise Value ($m) $319 35

Legend $319 million valuation facilitates substantial value uplift based on peer group multiples Valuation & Peer Group 2021-2023 Revenue CAGR 114.8% 34.0% 69.6% (5.3%) 44.5% 38.9% 33.6% Market Capitalization ($m) $441m $4,776m $1,489m $1,619m $1,732m $8,308m $691m EV / EBITDA Multiples Core Comps Other 36 Core Comps Other Note: Market data as of October 16, 2020. Market capitalization presented on a fully diluted basis using the treasury stock method.Advent multiples represent implied Transaction Adjusted multiples based on PF Enterprise Value of $319m. “NM” indicates the data is not meaningful. “NA” indicates not enough data is available. Developer & producer of hydrogen fuel cell stacks and systems Developer & manufacturer of PEM fuel cells Design and manufacturing of hydrogen fuel cell systems Fuel cell technology & engineering company Direct gas / natural gas fuel cell manufacturer PEM technology for hydrogen electrolysers and fuel cells EV / REVENUE Multiples (1) (1) 2022E 2023E 2024E Advent 2024E Multiple Advent 2024E Multiple

Recent investments demonstrate strong demand for fuel cell exposure Significant Strategic Interest in Fuel Cell Technology Acquirer Announcement Date January 22, 2020 October 3, 2019 June 28, 2019 March 26, 2019 August 29, 2018 May 16, 2018 Transaction Summary Bosch increases stake in Ceres Power and forms partnership Linde acquires 19% stake in ITM Power and forms JV Cummins completes acquisition of Hydrogenics MAN Energy Solutions acquires 40% stake in H-TEC Systems Weichai Power Co. acquires 19.9% stake in Ballard Power Systems and forms JV Weichai Power Co. acquires 20% stake in Ceres Power and forms JDA Target Target Description Bosch and Ceres formed a partnership to apply Ceres’ fuel cell technology to create small power stations for cities, factories, datacenters and EV charging points Manufacturer of PEM electrolyzers for the electro-chemical splitting of water into hydrogen and oxygen Designs, develops, and manufactures hydrogen generation products based on water electrolysis technology and fuel cell products based on proton exchange membrane (PEM) technology Leading producer of PEM electrolyzers and PEM stacks Engages in the design, development, manufactures, sale, and service of PEM fuel cell products Weichai and Ceres announced a strategic investment and joint development agreement (JDA) to develop bus Range Extenders and commercial EVs Key Details $140m invested to date(1)$102m investment to increase stake from 4% to 18%(1)Spent $12m on initial 4% and incremental $26m license(1) Linde and ITM Power to form a JV to target large-scale industrial users of hydrogenTotal investment of $76m(2) $290m TEVTEV / LTM Revenue 8.5x Undisclosed $163m equity investment$90m technology transfer related to JV formation to support China’s FCEV market Investment of $61m for a 20% interest(3)License Agreement for $50m(3)Joint development of a 30kW range-extender systems Electric bus manufacturing JV Source: Company filings. (1) Based on an exchange rate of 1.31 USD/GBP as of January 22, 2020. (2) Based on an exchange rate of 1.29 USD/GBP as of October 3, 2019. (3) Based on exchange rate of 1.28 USD/GBP as of December 1, 2020. 37

www.advent.energy 6. Conclusion

www.advent.energy Conclusion Developing and manufacturing the critical components for high-growth new energy markets Provides low-cost, fuel-flexible and resilient and fuel cell technology Experienced management team partnering with world-class research centers Proven, scalable business model that delivers consistent and recurring revenue Advent’s technologies solve range and recharge mobility problems Advent’s HT-PEM technologies are an essential component needed to unlock the Hydrogen Economy Platform technology provides critical performance benefits for a wide range of end markets

www.advent.energy Appendix

Product development program to reduce cost and increase power output Product Development InitiativesFuel Cells New MEAs outperform competition Achieve power density close to LT-PEM pure hydrogen MEAsWorks anywhere: extreme temperature, humidity, pollutionLong lifetime reduces total cost of ownershipFuel flexibility wins in niche markets Minimum Cost Catalyst Can reduce the platinum load by 10x compared to current state-of-the artPlatinum free catalysts also in R&D stage New Bipolar Plates drop weight for Auto and Aviation markets Will reduce the weight by 4x without the use for expensive metal alloys Reduce Production Cost Simpler Design Specific Initiatives to reduce cost per unit as demand scales upStrong expertise in-house Current Future 10x reduction in fuel cell platinum needs 41 1 2 3 4 5

Well-Established Global Policy Support for Fuel Cells 42 Long-term Market Trends (Deloitte / Ballard report) Item Details Hydrogen Refueling Stations – 2030 targets US: 7,100EU: 3,700Japan: 900China: 500 (trebled capacity in 2019) Publicly-announced FCEV targets in 2030 by country US 5.3 millionJapan 0.8 million (passenger vehicles)Europe 3.7 million FCEVs by 2030 and in addition 0.5m fuel cell LCVs, 45,000 fuel cell trucks & buses Selected Targets by Company Hyundai targeting 500,000 FCEVs on the road in 2030Toyota targeting 30,000 FCEV sales annually from 2020 onwards US State Level - Ambitious Targets California alone is targeting 1 million FCEVs and 1,000 refueling stations in 2030 Other Trends Participants of the Hydrogen Energy Ministerial (global clean energy forum involving all major nations including China, India, USA, Japan, Korea, Germany, France, UK, Brazil, Canada and Australia) signed up to a global target of 10,000,000 FCEVs on the road by 2030EU target of 32% replacement of natural gas for heating with hydrogen by 2040Japan is the leader in stationary CHP fuel cells – 20,000 deployed to date; and in FCEV’s – Toyota Mirai launched in 2014 Favorable global policies are just one of the tailwinds driving the growth of the global Hydrogen Economy

More Countries are Looking to Phase Out Internal Combustion Engines (“ICE”) 17 countries have taken varying types of action, from soft targets to strong commitments, to phase out ICE vehicles and increase the number of EVs 43 Country Action Announced Date Announced Austria No new ICE vehicles sold after 2020 2016 Britain No new ICE vehicles sold after 2040 2017 California (U.S.) No new ICE vehicles sold after 2035 2020 China End production and sales of ICE vehicles by 2040 2017 Denmark 5,000 EVs on the road by 2019, tax incentives in place Since 2008 France No new ICE vehicles sold after 2040 2017 Germany No registration of ICE vehicles by 2030 (passed by legislature) 2016 India No new ICE vehicles sold after 2030 2017 Ireland No new ICE vehicles sold after 2030 2017 Israel No new ICE vehicle imports after 2030 2018 Japan Incentives program in place for EV sales Since 1996 Netherlands No new ICE vehicles sold after 2030 2017 Norway Incentives program in place for EV sales Since 1990 Portugal Official target and incentives in place for EV sales Since 2010 Scotland No new ICE vehicles sold after 2032 2017 South Korea EVs account for 30% of auto sales by 2020 2016 Spain Official target and incentives in place for EV sales 2017 Taiwan Phase out of fuel-powered motorcycles by 2035 and fuel-powered vehicles by 2040 2017 Source: The Climate Center.

Glossary Abbreviation Term Description BEV Battery electric vehicle Vehicle using exclusively battery technology BOM Bill of materials List of raw materials, assemblies and parts and quantities of each to manufacture a finished product CHP Combined heat and power Also known as cogeneration, CHP is primarily used in industrial applications DoE U.S. Department of Energy Primary governmental body responsible for clean energy R&D FCEV Fuel cell electric vehicle Vehicle using fuel cell technology, often in conjunction with batteries HDV Heavy-duty vehicle A vehicle exceeding 26,001 pounds HT-PEM High-temperature proton exchange membranes Operate at 160°C to 200°C ICE Internal combustion engine Standard heat engine used in traditional vehicles IoT Internet of Things System of interrelated computing devices able to transfer data over a network Abbreviation Term Description Li-ion Lithium Ion Common battery used in consumer electronics and EVs MEA Membrane electrode assembly Assembled stack of proton exchange membranes; heart of the fuel cell MDV Medium-duty vehicle A vehicle weighing 10,001 – 26,000 pounds OEM Original equipment manufacturer Company that produces devices from intermediate components PHEV Plug-in hybrid electric vehicle Combines ICE with battery-powered electric vehicles RFB Redox flow battery Industrial scale rechargeable battery that can be used in industrial scale applications SOFC Solid oxide fuel cell Highest temperature fuel cell (800°C to 1,000°C) -- Electrolysis Process using direct electric current (DC) to drive chemical reaction -- eFuels Synthetic fuels resulting from electrolysis of water with renewable energy and CO2 44

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