New photocatalyst group for water decomposition of RuO2-loaded p-block metal (In, Sn, and Sb) oxides with d(10) configuration

For the decomposition of pure water to hydrogen and oxygen, MIn2O4 (M = Ca, Sr), Sr2SnO4, and NaSbO3 were found to make stable photocatalysts when com bined with RuO2. The metal oxides are composed of the d(10) p-block metal i ons (In3+, Sn4+, and Sb5+), and it is demonstrated that the p-block metal o xides with d(10) configuration form a new photocatalyst group different fro m the conventional metal oxide photocatalyst group consisting of the octahe drally coordinated d(0) transition-metal ions such as Ti4+, Zr4+, Nb5+, and Ta5+.