1. Department of Chemistry, Graduate School of Science & Research Center for Materials Science (RCMS) & Integrated Research Consortium on Chemical Science (IRCCS) & Institute for Advanced Study, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8602, Japan
2. Innovation Research Center for Fuel Cells, The University of Electro-Communications, Chofu, Tokyo, 182-8585 Japan
3. Japan Synchrotron Radiation Research Center, SPring-8, Koto, Sayo, Hyogo 679-5198, Japan