1. Pacific Northwest National Laboratory, Richland, WA, 99352, USA http://www.pnnl.gov/
2. Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, CA, 91125, USA Homepage: http://solarfuelshub.org/
3. Current address: Department of Chemistry, University of California‐Irvine, 1102 Natural Sciences II, Irvine, CA, 92697, USA, http://www.chem.uci.edu/people/jenny‐yang/