1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2. Center of Materials Sciences and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
4. Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China