1. Fuel Cell Nanomaterials Center, University of Yamanashi, Miyamae 6-43, Kofu 400-0021, Japan
2. Special Doctoral Program for Green Energy Conversion Science and Technology, Interdisciplinary Graduate School of Medicine, Engineering and Agricultural Science, Takeda 4, Kofu, University of Yamanashi, Kofu 400-8510, Japan
3. General R&D Laboratory, Nihon Kagaku Sangyo Co. Ltd., Nakane 1-28-13, Soka, Saitama 340-0005, Japan
4. NISSAN ARC Ltd., Natsushima 1, Yokosuka, Kanagawa 237-0061, Japan