| Abstract
| - Photochemical reactions on LaTiO2N, a perovskite-type oxynitride, were examined. Under visible-lightirradiation (420 nm < λ < 600 nm), LaTiO2N reduced H+ into H2 and oxidized H2O into O2 in the presenceof a sacrificial electron donor (methanol) or acceptor (Ag+) by the band gap transition (2.1 eV). Oxidationof water proceeded with little degradation of the oxynitride, whereas partial substitution of Ca2+ for La3+ ofLaTiO2N and modification by IrO2 colloid markedly suppressed degradation of the oxynitride and increasedO2 evolution efficiency.
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