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