Osamu Kurata1, Norihiko Iki1, Takahiro Inoue1, Takayuki Matsunuma1, Taku Tsujimura2, Hirohide Furutani2, Masato Kawano3, Keisuke Arai3, Ekenechukwu C. Okafor4, Akihiro Hayakawa4 and Hideaki Kobayashi4, (1)National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan, (2)Fukushima Renewable Energy Institute, AIST (FREA), Koriyama, Japan, (3)Toyota Energy Solutions Inc., Aichi, Japan, (4)Tohoku University, Sendai, Japan