Green hydrogen, made the green way: sunlight electrodes brewed in water at 4 volts

Making solar-hydrogen electrodes used to mean toxic solvents and 200 volts of processing. Professors Jongmin Choi of DGIST and Younghoon Kim of Kookmin University in South Korea have replaced all of it with a water-based coating done at 4 volts — battery voltage — in three minutes. Their sunlight-driven electrode produces a photocurrent tenfold or more above single-material designs, keeps 65.1% of its performance after two hours of light, and uses no lead or cadmium. Published in the journal Small, it is a cleaner route to clean fuel: hydrogen made by sunlight, manufactured without the dirty parts.

SDG 7 · Affordable and clean energy — Mechanism: tech innovation