1. Energy Technologies Area, Energy Conversion Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Bend, Oregon 97702, United States
3. Department of Material Science and Engineering, University of California Irvine, Irvine, California 92697, United States
4. National Fuel Cell Research Center,
Department of Chemical Biomolecular Engineering,, University of California Irvine, Irvine, California 92697, United States