1. Institute for Catalysis, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan
2. Department of Chemical Engineering, University of South Carolina, 541 Main Street, Columbia, South Carolina 29208, United States
3. Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8579, Japan
4. Innovation Research Center for Fuel Cells, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
5. Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5148, Japan