1. College of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 P. R. China
2. Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
3. Kenneth S. Pitzer Center for Theoretical Chemistry University of California Berkeley Berkeley CA 94720 USA
4. Center for High Pressure Science and Technology Advanced Research Shanghai 201203 P. R. China
5. Dalian National Laboratory for Clean Energy and State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China
6. Key Lab of Mobile Materials MOE School of Materials Science and Engineering and Electron Microscopy Center and International Center of Future Science Jilin University Changchun 130012 P. R. China