, Volume 11, Issue 4, pp 145-157
Date: 31 Oct 2007

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

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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.