1. Solution Development Division, Electric Works Company, Panasonic Corporation, 3-1-1 Yagumo-nakamachi, Moriguchi, Osaka 570-8501, Japan
2. Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
3. Division of Energy and Photochemical Engineering, Research Center for Solar Energy Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
4. Department of Applied Chemistry, Waseda University, 3-4-1 Ohkubo, Shinjukuku, Tokyo 169-8555, Japan