Fraunhofer ISE achieves 31.3% record solar-to-hydrogen efficiency in CPV electrolysis

Researchers at the German institute built a photovoltaic water electrolysis system based on micro-concentrator photovoltaics coupled to proton exchange membrane electrolysis. Outdoor testing demonstrated a record solar-to-hydrogen efficiency of 31.3%, achieved by a four-junction CPV system driving two PEM cells in series under real operating conditions.

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