1. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
2. Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute, and Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
3. Fuels and Energy Technology Institute and WA School of Mines: Minerals, Energy, and Chemical Engineering, Curtin University, Perth, Western Australia 6102, Australia
4. School of Materials Science and Engineering, Beihang University, Beijing, 100191, P.R. China
5. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, 37831, United States
6. Australian Synchrotron, Clayton, Victoria 3168, Australia
7. Advanced Carbon Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China
8. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States