1. Department of Materials Engineering Science
2. Graduate School of Engineering Science
3. Osaka University
4. Osaka 560-8531
5. Japan
6. Institute for Catalysis
7. Hokkaido University
8. Sapporo 001-0021
9. Department of Chemistry
10. Tokyo Metropolitan University
11. Tokyo 192-0397
12. Research Center for Ultra-High Voltage Electron Microscopy
13. Ibaraki