1. Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
2. The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. Applied Science and Technology Graduate Group, University of California, Berkeley, Berkeley, CA 94720, USA.
4. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA.
5. National Center for Electron Microscopy, The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
6. College of Engineering, University of California, Berkeley, Berkeley, CA 94720, USA.
7. Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA 94720, USA.