1. Polymer Electrolyte Fuel Cell Group, Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
2. Clean Energy Research Center, University of Yamanashi; 4 Takeda Kofu 400-8510 Japan
3. Battery Materials Unit, National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan