1. Department of Material Science and Engineering, University of California Irvine, Irvine, California 92697, United States
2. Nel Hydrogen, Wallingford, Connecticut 06492, United States
3. De Nora Tech, LLC, Concord, Ohio 44077, United States
4. Department of Chemical and Biomolecular Engineering; National Fuel Cell Research Center, University of California Irvine, Irvine, California 92697, United States
5. Energy Technologies Area, Energy Conversion Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States