Hydrogen production from water on oxynitride photocatalysts

Kazuhiko Maeda; Kazunari Domen

doi:10.1117/12.680111

31 August 2006 Hydrogen production from water on oxynitride photocatalysts

Kazuhiko Maeda, Kazunari Domen

Proceedings Volume 6340, Solar Hydrogen and Nanotechnology; 63400Q (2006) https://doi.org/10.1117/12.680111
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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, (Ga_1-xZn_x)(N_1-xO_x), 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 (Ga_1-xZnx)(N_1-xO_x) for overall water splitting is dependent strongly on both the cocatalyst and the crystallinity and composition of the material. The quantum efficiency of (Ga_1-xZnx)(N_1-xO_x) with Rh and Cr mixed-oxide (Rh_2-yCr_yO₃) nanoparticles reaches 2-3 % at 420-440 nm, which is the highest reported efficiency for overall water splitting in the visible-light region.

Citation Download Citation

Kazuhiko Maeda and Kazunari Domen "Hydrogen production from water on oxynitride photocatalysts", Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 63400Q (31 August 2006); https://doi.org/10.1117/12.680111

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