1. Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
2. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
3. Fuel Cell Cutting-Edge Research Center Technology Research Association, Aomi, Koto, Tokyo 135-0064, Japan
4. Japan Synchrotron Radiation Research Institute (JASRI), Koto, Sayo, Hyogo 679-5198, Japan