1. Department of Materials Science and Technology, Faculty of Engineering, Niigata University, 8050 Ikarashi-2, Niigata 9050-2181, Japan
2. Chemistry Department, Faculty of Science, Tanta University, Tanta 511111, Egypt
3. Institute of Science and Technology Research, Centre for Chemical Energy Conversion Res., Chubu University, Kasugai 487-8501, Japan