, 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

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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.

Kazuhiko Maeda—Research Fellow of the Japan Society for the Promotion of Science (JSPS).