Overall water splitting using (oxy)nitride photocatalysts

Abstract

Abstract Oxynitride photocatalysts with d 10 electronic configuration are presented as effective non-oxide catalysts for overall water splitting. Germanium nitride (β-Ge 3 N 4 ) having a band gap of 3.8-3.9 eV modified with RuO 2 nanoparticles as a cocatalyst is shown to achieve stoichiometric decomposition of H 2 O into H 2 and O 2 under UV irradiation (λ > 200 nm). A novel solid solution of GaN and ZnO, (Ga 1- x Zn x )(N 1- x O 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 is attributed to the bonding between Zn and N atoms at the top of the valence band. The photocatalytic activity of (Ga 1- x Zn x )(N 1- x O x ) for overall water splitting is strongly dependent on both the cocatalyst and the crystallinity and composition of the material. The quantum efficiency of (Ga 1- x Zn x )(N 1- x O x ) with Rh and Cr mixed-oxide nanoparticles is 2-3 % at 420-440 nm, which is the highest reported efficiency for overall water splitting in the visible-light region.

Keywords

Affiliated Institutions

• Kyoto Institute of Technology JP
• Nagaoka University of Technology JP
• The University of Tokyo JP

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