1. Faculty of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
2. Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
3. Innovation Research Center for Fuel Cells, The University of Electro-Communications, Chofugaoka,
Chofu, Tokyo 182-8585, Japan
4. Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
5. Department of Applied Chemistry, Meijo University, Nagoya 468-8502, Japan
6. Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1, Naka-ku, Hamamatsu 432-8561, Japan