Catalysis Surveys from Asia

, Volume 11, Issue 4, pp 145–157

Development of Cocatalysts for Photocatalytic Overall Water Splitting on (Ga1−xZnx)(N1−xOx) Solid Solution



The development of cocatalysts promoting overall water splitting on (Ga1−xZnx)(N1−xOx) solid solution photocatalyst is presented. The (Ga1−xZnx)(N1−xOx) is a stable visible-light-driven photocatalyst for stoichiometric water splitting upon loading with a suitable nanoparticulate cocatalyst. Loading with a combination of Cr and Rh oxides, Rh2−yCryO3, is demonstrated to raise the quantum efficiency of (Ga1−xZnx)(N1−xOx) for overall water splitting to 2.5% at 420–440 nm. This represents a 10-fold increase in efficiency over the highest efficiency previously obtained using nanoparticulate RuO2 as a cocatalyst. In addition to the composition, the dispersion and size of cocatalyst nanoparticles are identified as important factors affecting the degree of enhancement for stoichiometric water splitting.


Cocatalyst Heterogeneous photocatalysis Hydrogen Overall water splitting Photocatalyst Solar energy conversion 

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Kazuhiko Maeda
    • 1
  • Kentaro Teramura
    • 1
    • 2
  • Kazunari Domen
    • 1
  1. 1.Department of Chemical System EngineeringThe University of TokyoTokyoJapan
  2. 2.Pioneering Research Unit for Next GenerationKyoto UniversityKyotoJapan

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