1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Kavli Energy NanoScience Institute, Berkeley, California 94720, United States
3. National Center for Electron Microscopy Facility, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
5. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
6. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States