1. Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
2. Leibniz Institute of Surface Engineering (IOM), Permoserstr. 15, D-04318 Leipzig, Germany
3. Kavli Energy NanoScience Institute, University of California—Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Department of Materials Science and Engineering, University of California—Berkeley, Berkeley, California 94720, United States