1. Energy
Technology Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
2. Department
of Chemical System Engineering, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
3. Institute
for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
4. Synchrotron
Radiation Research Organization, The University of Tokyo, Tatsuno, Hyogo 679-5165, Japan
5. Department
of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku,
Tokyo 113-8656, Japan
6. Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Nishikyo-ku, Kyoto 615-8245, Japan