Abstract
Photocatalysis of Cu 2 O powder was investigated to evaluate its ability for the stoichiometric decomposition of water into O 2 and H 2 . Although thus far it has been indicated that Cu 2 O can function as a photocatalyst for the overall water splitting, H 2 evolution was found to take place solely while there was no generation of O 2 . Moreover, the evolution rate of H 2 gradually decreased during prolonged irradiation, and consequently, the evolution of H 2 ceased. From the structural analyses of deactivated Cu 2 O, it appeared that the H 2 evolution originates in the self-oxidation of Cu 2 O to CuO.
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