1. Korea Institute of Science and Technology (KIST), Fuel Cell Research Center; Hwarangno 14-Gil 5 Seongbuk-Gu Seoul 02792 Republic of Korea
2. Department of Chemical and Biological Engineering; Korea University; Seoul 136-713 Republic of Korea
3. Energy and Environmental Engineering; Korea University of Science and Technology (UST); Daejeon Republic of Korea
4. Faculty of Chemistry; Jagiellonian University; Ingardena 3 Krakow 30-060 Poland
5. Green School, Korea University; Seoul 136-713 Republic of Korea