Highly Stable GaN Photocatalyst for Producing H₂ Gas from Water

Abstract

Efficient production of H 2 from water without the use of an extra bias or any sacrificial reagents is possible using a GaN photocatalyst with a NiO cocatalyst. The average energy conversion efficiency from light energy to H 2 energy was approximately 1% for 500 h. The total amount of hydrogen was 184 mL/cm 2 of the GaN surface. H 2 production rate was as high as 0.37 mL/(cm 2 ·h).