1. Research Institute of Electrochemical Energy, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
2. Faculty of Science and Engineering, Doshisha University, 1-3 Miyakodani-Tatara, Kytotanabe, Kyoto 610-0321, Japan
3. Engineering Department, ISHIFUKU Metal Industry Co., Ltd., 2-12-30 Aoyagi, Soka, Saitama 340-0002, Japan