1. Graduate School of Engineering; Kyushu University; Fukuoka 819-0395 Japan
2. Next-Generation Fuel Cell Research Center (NEXT-FC); Kyushu University; Fukuoka 819-0395 Japan
3. World Premier International Research Center Initiative, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; Fukuoka 819-0395 Japan
4. Center of Innovation, Center for Co-Evolutional Social Systems (COI-CESS); Kyushu University; Fukuoka 819-0395 Japan