Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S‐Defection in a Self‐Assembled Microscale <scp>CuS</scp>/<scp>rGO</scp>/<scp>CP</scp> Photoanode

CuS is an encouraging photoelectrode candidate that meets the essential requirements for efficient solar-to-hydrogen production, but it has not been thoroughly studied. A light absorber layer grown by self-assembly of copper and sulfur precursors on a carbon paper (CP) electrode. Simultaneously, rGO introduced as buffer to control optical electrical properties absorber. The well-ordered microstructural arrangement suppresses recombination loss electrons holes owing enhanced charge-carrier generation, separation, transport. potential reaching 10 mA cm−2 in 1.0 m KOH solution significantly lowered 0.87 V, photocurrent density at 1.23 V 94.7 cm−2. computational result reveals potential-determining step sensitive O* stability; lower stability thin CuS/rGO decreases free-energy gap between initial final states step, resulting lowering onset potential. faradaic efficiency photoelectrochemical oxygen evolution reaction optimized 2CuS/1rGO/CP photoanode 98.60%, applied bias photon-to-current efficiencies are 11.2% 15.7%, respectively, its ultra-high performance maintained 250 h. These record-breaking achievement indices may be trigger establishing green hydrogen economy.