Development of Cocatalysts for Photocatalytic Overall Water Splitting on (Ga1? x Zn x )(N1? x O x ) Solid Solution |
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| Authors: | Kazuhiko Maeda Kentaro Teramura and Kazunari Domen |
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| Institution: | (1) Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;(2) Present address: Pioneering Research Unit for Next Generation, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan |
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| 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.
Kazuhiko Maeda—Research Fellow of the Japan Society for the Promotion of Science (JSPS). |
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| Keywords: | Cocatalyst Heterogeneous photocatalysis Hydrogen Overall water splitting Photocatalyst Solar energy conversion |
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