1. Inorganic Functional Materials Research Institute; National Institute of Advanced Industrial Science and Technology (AIST); Nagoya 463-8560 Japan
2. Materials Technology and Nanotechnology Department; New Energy and Industrial Technology Development Organization (NEDO), 19F MUZA Kawasaki Central Tower; Kawasaki 212-8554 Japan
3. Fukushima Renewable Energy Institute; AIST; Kohriyama 963-0298 Japan
4. Research Institute for Energy Conversion; AIST; Tsukuba 305-8564 Japan
5. Catalysis Division; Mitsui Mining & Smelting Co., Ltd; Ageo 362-0021 Japan