1. Department of Chemistry Tsinghua University Beijing 100084 China
2. Institute of Advanced Materials, Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China
3. College of Chemistry and Chemical Engineering Central South University Hunan 410083 China
4. Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences China
5. Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Science Shanghai 100049 China
6. Institute of Physics Chinese Academy of Science Beijing 100190 China
7. Center for Electron Microscopy Tianjin University of Technology Tianjin 300384 China