Advent SPAC Presentation Deck

Highly Attractive Pipeline $13.0m $9.0m Development of Revenue by Source $4.0m 2021E Grants Existing Customers $254.8m $21.9m $90.5m $135.6m $6.9m 2025E Grants Existing Customers (MEA & License Fees) New Customers (MEA & License Fees) Engineering Fees (New Customers) >60% of 2025E MEA sales projected to come from existing 2020 customers Customer Multiple OEMs - Fuel Cell EV trucks Asian fuel cell manufacturer US OEM - portable power Asia - EV charging stations US loT-gas sensor www.advent.energy Select Identified Opportunities Advent Product Details HT-PEM fuel cells MEA MEA (Durability and Temperature Resilience) HT-PEM fuel cells Membranes for heat resistivity ● 5,000+ trucks on the road @ 200kW per truck 1GW potential opportunity in 2025 Existing customer MoU in place envisages >5m MEAs in 2023 - 2x forecast MEA production OEM currently supplies portable power fuel cell units to 4 military units globally, including in the U.S. and U.K. Existing customer Projected revenue opportunity $20m in 2025 from single product only Target 4,500 stations @ 240kW per station = 1.1 GW opportunity Silicon Valley-based US developer OEMS - two global cellphone manufacturers Cellphone market opportunity alone represents $25m in 2025 AMCI ADVENT Acquisition Corp 30

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