1. Tokyo Gas Co., Ltd., 1-7-7 Suehiro-cho, Tsurumi-ku; Fundamental Technology Dept; Yokohama City Kanagawa Japan
2. Next-Generation Fuel Cell Research Center; Kyushu University, 744 Motooka, Nishi-ku; Fukuoka City Fukuoka Japan
3. International Institute for Carbon-Neutral Energy Research (WPI-I CNER); Kyushu University, 744 Motooka, Mshi-ku; Fukuoka City Fukuoka Japan
4. International Research Center for Hydrogen Energy; Kyushu University, 744 Motooka, Mshi-ku; Fukuoka City Fukuoka Japan
5. Faculty of Engineering; Kyushu University, 744 Motooka, Mshi-ku; Fukuoka City Fukuoka Japan