Article

Catalysis Surveys from Asia

, Volume 11, Issue 4, pp 145-157

Development of Cocatalysts for Photocatalytic Overall Water Splitting on (Ga1−x Zn x )(N1−x O x ) Solid Solution

  • Kazuhiko MaedaAffiliated withDepartment of Chemical System Engineering, The University of Tokyo
  • , Kentaro TeramuraAffiliated withDepartment of Chemical System Engineering, The University of TokyoPioneering Research Unit for Next Generation, Kyoto University
  • , Kazunari DomenAffiliated withDepartment of Chemical System Engineering, The University of Tokyo Email author 

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

The development of cocatalysts promoting overall water splitting on (Ga1−x Zn x )(N1−x O x ) solid solution photocatalyst is presented. The (Ga1−x Zn x )(N1−x O x ) 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−y Cr y O3, is demonstrated to raise the quantum efficiency of (Ga1−x Zn x )(N1−x O x ) 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.

Keywords

Cocatalyst Heterogeneous photocatalysis Hydrogen Overall water splitting Photocatalyst Solar energy conversion