1. The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
2. INPEX Corporation, 5-3-1 Akasaka, Minato-ku, Tokyo 107-6332, Japan
3. Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
4. Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan