1. Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. Liquid Sunlight Alliance, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA.
5. Kavli Energy NanoScience Institute, Berkeley, CA 94720, USA.