1. National Fuel Cell Research Center, Department of Chemical and Biomolecular Engineering, University of California Irvine, Irvine, California 92697, United States
2. Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
3. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5612 AZ Eindhoven, Netherlands
4. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Material Physics and Application, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States