1. Department of Chemical and Biomolecular Engineering, University of California, Irvine, California 92617, United States
2. National Fuel Cell Research Center, University of California, Irvine, California 92617, United States
3. Department of Materials Science and Engineering, University of California, Irvine, California 92617, United States
4. Department of Aerospace Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61820, United States
5. Hydrogen and Fuel Cell Center, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States