1. Research Center
for Solar Energy Chemistry, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
2. Department of Chemistry, Konan University, 9-1 Okamoto, Higashinada, Kobe, Hyogo 658-8501, Japan
3. Department of Electrical and Electronic Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan