1. Graduate School of Human and Environmental Studies, Kyoto University, Yoshida nihonmatsu-cho, Sakyo-ku, Kyoto 606-8316, Japan
2. Department of Applied Chemistry, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku, Osaka 535-8585, Japan
3. Japan Synchrotron Radiation Research Institute (JASRI), Sayo-gun, Hyogo 679-5198, Japan
4. Nissan Analysis and Research Center, 1, Natsushima-cho, Yokosuka-shi, Kanagawa 237-8523, Japan
5. Fuel Cell Cutting-Edge Research Center Technology Research Association, 2-3-26, Aomi, Koto-ku, Tokyo 135-0064, Japan