Affiliation: | 1. Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama, Toyonaka, Osaka 560‐8531 (Japan), Fax: (+81)?6‐6850‐6260;2. Research Center for Solar Energy Chemistry, Osaka University, 1–3, Machikaneyama, Toyonaka, Osaka 560‐8531 (Japan) |