1. Clean Energy Research Center, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan
2. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Kofu, Yamanashi 400-8510, Japan
3. Technology Division, Panasonic Corporation, Yagumo-naka-machi 3-1-1, Moriguchi 570-8501, Japan
4. Appliances Company, Panasonic Corporation, Noji-higashi 2-3-1-1, Kusatsu 525-8520, Japan
5. Fuel Cell Nanomaterials Center, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan
6. Department of Applied Chemistry, and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan