1. Photocatalyst Group, Kanagawa Academy of Science and Technology, KSP East 412, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan city, Hubei Province 430070, People's Republic of China
3. Organic Solar Cell Assessment Project, Kanagawa Academy of Science and Technology, KSP Building East 308, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
4. Research Institute for Science and Technology, Energy and Environment Photocatalyst Research Division, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan