1. Energy Research Institute, Interdisciplinary Graduate School, Nanyang Technological University, Singapore 637371, Singapore
2. School of Materials Science and Engineering, Nanyang Technological University, Singapore 637371, Singapore
3. NUSNNI-NanoCore, National University of Singapore, Singapore 117576, Singapore
4. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
5. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
6. Dynamics of Condensed Matter and Center for Sustainable Systems Design, Chair of Theoretical Chemistry, University of Paderborn, Warburger Str. 100, D−33098 Paderborn, Germany
7. Berkeley Educational Alliance for Research in Singapore (BEARS), Ltd., 1 Create Way, 138602 Singapore