1. Department of Electric Engineering
and Computer Sciences and Department of Materials Science and Chemistry, University of Hyogo, Shosha 2167, Himeji, Hyogo, 671-2280,
Japan
2. Energy Technology
Laboratories, Osaka Gas Co., Ltd., 6-19-9,
Konohana-Ku, Osaka, 554-0051,
Japan
3. Faculty of Engineering, Shizuoka University, Hamamatsu, Japan
4. Department of Chemistry, Faculty
of Science, University of Peradeniya, Peradeniya,
Sri Lanka