1. Graduate School of Science, Department of Chemistry, Chiba University, Inage, Chiba 263-8522, Japan
2. Research Center for Exotic Nanocarbons, Shinshu University, Wakasato, Nagano, 380-8553, Japan
3. Graduate School of Engineering, Department of Applied Chemistry, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8538, Japan
4. Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Sakyoku, Kyoto 615-8510, Japan
5. Energy Technology Laboratory, Osaka Gas Co., Ltd., Konohana, Osaka 554-0051, Japan