1. Catalysis
Research Center, Hokkaido University, N-21, W-10, Kita-ku, Sapporo 001-0021, Japan
2. Department
of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima 739-8527, Japan
3. JST,
PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
4. Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1 Kouto, Sayocho, Sayogun, Hyogo 679-5198, Japan
5. High
Voltage Electron Microscope Laboratory, Center for Advanced Research
of Energy Conversion Materials, Hokkaido University, Sapporo 060-8626, Japan