Highly Stable GaN Photocatalyst for Producing H2 Gas from Water

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). (C) 2013 The Japan Society of Applied Physics