1. Institute
for Multidisciplinary Convergence of Matter, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
2. Department
of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea
3. Fuel
Cell Vehicle Team 1, Eco-Technology Center, Hyundai-Kia Motors, Yongin-Si, Gyeonggi-Do 446-912, Republic of Korea