1. Institute
of Radiochemistry, Helmholtz Zentrum Dresden-Rossendorf, P.O. Box 51 01
19, 01314 Dresden, Germany
2. Department of Materials and
Life Science, Seikei University, 3-3-1,
Kichijoji-kitamachi, Musashino-shi, Tokyo 180-8633, Japan
3. Innovation Research Center for
Fuel Cells, The University of Electro-Communications, 1-5-1, Chofugaoka, Chofu-shi, Tokyo 182-8585, Japan