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German Lab Achieves Record Sunlight-to-Hydrogen Efficiency but Most Green-Hydrogen Projects Face Delays
Researchers at Fraunhofer ISE combined III-V solar cells with PEM electrolyzers to convert sunlight straight into hydrogen. The July 1, 2026 report notes the prototype skips electricity generation and that the lead researcher is seeking investors for a spin-off.
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com reported July 1, 2026. The prototype in Freiburg, Baden-Württemberg, bypasses electricity generation entirely. ” Dimroth is seeking investors for a planned spin-off named Clearsun Energy.
The III-V cells used in the device have previously flown on spacecraft. The development arrives as green-hydrogen projects face delays. A 2025 Nature Energy study found that only 7 percent of announced global capacity was completed on schedule in 2023.
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