1. Tokyo Gas Co., Ltd. Fundamental Technology Department 1‐7‐7 Suehiro‐cho, Tsurumi‐ku 230‐0045 Yokohama City, Kanagawa Japan
2. Kyushu University Next‐Generation Fuel Cell Research Center (NEXT‐FC) 744 Motooka, Nishi‐ku 819‐0395 Fukuoka City, Fukuoka Japan
3. Kyushu University Center for Co‐Evolutional Social Systems (CESS) 744 Motooka, Nishi‐ku 819‐0395 Fukuoka City, Fukuoka Japan
4. Kyushu University Faculty of Engineering 744 Motooka, Nishi‐ku 819‐0395 Fukuoka City, Fukuoka Japan
5. The University of Tokyo Graduate School of Frontier Sciences 1‐5 Kashiwanoha, Kashiwa‐shi 277‐8563 Chiba Japan
6. International Institute for Carbon‐Neutral Energy Research (WPI‐I2CNER) 744 Motooka, Nishi‐ku 819‐0395 Fukuoka City, Fukuoka Japan
7. Kyushu University International Research Center for Hydrogen Energy 744 Motooka, Nishi‐ku 819‐0395 Fukuoka City, Fukuoka Japan