Hydrogen generation for 500 hours by photoelectrolysis of water using GaN

W. Ohara, D. Uchida, T. Hayashi, M. Deura, K. Ohkawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


We confirmed that GaN photocatalyst with NiO cocatalyst (GaN-NiO) continuously produced hydrogen from water for 500 hours without any extra bias. The GaN-NiO photocatalyst was hardly etched and 184-mL hydrogen gas was produced from the electric charge of 1612 coulombs, the Faradic efficiency of which was 89.2%. The conversion efficiency from incident light energy to hydrogen chemical energy was 0.98% in average for 500 h. The incident photon-to-current conversion efficiency (IPCE) was 50% at 300 nm and 35% at 350 nm after the experiment, which was much higher than those of other semiconductor-based photocatalysts.

Original languageEnglish
Title of host publicationMaterials for Catalysis in Energy
Number of pages5
Publication statusPublished - 2012 Oct 23
Event2012 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2012 Apr 92012 Apr 13

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2012 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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