1. Department of Material Science and Engineering National Fuel Cell Research Center University of California Irvine CA 92697 USA
2. Department of Chemical and Biomolecular Engineering National Fuel Cell Research Center University of California Irvine CA 92697 USA
3. Department of Mechanical Engineering Karlsruhe Institute of Technology 76021 Karlsruhe Germany
4. Bosch Research and Technology Center North America Sunnyvale CA 94085 USA
5. Advanced Light Source Lawrence Berkeley National Laboratory Berkeley CA 94720 USA