1. Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
2. Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
3. Nissan Analysts and Research Center, Kanagawa 237-0061, Japan
4. Fuel Cell Cutting-Edge Research Center Technology Research Association, Tokyo 135-0064, Japan