1. Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
3. Department of Chemistry, Stanford University, Stanford, California 94305, United States
4. SUNCAT Center for Interface Science and Catalysis Stanford University, Stanford, California 94305, United States
5. Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
6. SLAC National Accelerator Laboratory Menlo Park, California 91125, United States