Development of Various Photovoltaic‐Driven Water Electrolysis Technologies for Green Solar Hydrogen Generation

Direct solar hydrogen generation via a combination of photovoltaics (PV) and water electrolysis can potentially ensure sustainable energy supply while minimizing greenhouse emissions. The PECSYS project aims at demonstrating solar-driven electrochemical system with an area >10 m2 high efficiency reasonable cost. Thermally integrated PV electrolyzers (ECs) using thin-film silicon, undoped, silver-doped Cu(In,Ga)Se2 silicon heterojunction combined alkaline to form one unit are developed on prototype level collection areas in the range from 64 2600 cm2 solar-to-hydrogen (StH) ranging ≈4 13%. Electrical direct coupling modules proton exchange membrane EC test effects bifaciality (730 area) study long-term operation under outdoor conditions (10 is also investigated. In both cases, StH efficiencies exceeding 10% be maintained over periods used. All reported based measured gas outflow mass flow meters.