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Proceedings Paper

Hydrogen production from water on oxynitride photocatalysts
Author(s): Kazuhiko Maeda; Kazunari Domen
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Paper Abstract

Oxynitrides are presented as effective non-oxide photocatalysts for overall water splitting. RuO2-loaded germanium nitride (β-Ge3N4) is shown to achieve stoichiometric decomposition of H2O into H2 and O2 under ultraviolet irradiation (λ > 200 nm). A novel solid solution of GaN and ZnO, (Ga1-xZnx)(N1-xOx), with a band gap of 2.4-2.8 eV (depending on composition) achieves overall water splitting under visible light (λ > 400 nm) when loaded with an appropriate cocatalyst. The narrower band gap of the solid solution originates from the bonding between Zn and N atoms at the top of the valence band. The photocatalytic activity of (Ga1-xZnx)(N1-xOx) for overall water splitting is dependent strongly on both the cocatalyst and the crystallinity and composition of the material. The quantum efficiency of (Ga1-xZnx)(N1-xOx) with Rh and Cr mixed-oxide (Rh2-yCryO3) nanoparticles reaches 2-3 % at 420-440 nm, which is the highest reported efficiency for overall water splitting in the visible-light region.

Paper Details

Date Published: 31 August 2006
PDF: 10 pages
Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 63400Q (31 August 2006); doi: 10.1117/12.680111
Show Author Affiliations
Kazuhiko Maeda, The Univ. of Tokyo (Japan)
Kazunari Domen, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 6340:
Solar Hydrogen and Nanotechnology
Lionel Vayssieres, Editor(s)

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