1. Department of Material Chemistry,
Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
2. Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku,
Sakai, Osaka 599-8531, Japan
3. JST-PRESTO, 4-1-8 Honcho Kawaguchi, Saitama
332-0012, Japan
4. Geodynamics
Research Center, Ehime University, 2-5
Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
5. Deutsches Elektronen Synchrotron, 22607 Hamburg, Germany
6. Department
of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510,
Japan