1. International Research Center for Hydrogen Energy, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2. The Ultra Microscopy Research Center, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
3. Toda Kogyo Corp., 1-4 Meijishingai, Otake, Hiroshima 739-0652, Japan
4. National Institute of Technology, Akashi College, 679-3 Nishioka, Uozumi-cho, Akashi, Hyogo 674-8501, Japan
5. Next-Generation Fuel Cell Research Center (NEXT-FC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
6. Graduate School of Engineering Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan