1. State Key Laboratory of Solid Lubrication; Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences; Lanzhou 730000 People's Republic of China
2. University of Chinese Academy of Sciences; Beijing 100049 People's Republic of China
3. Key Laboratory for Utility of Environment Friendly Composites and Biomass in universities of Gansu Province, College of Chemical Engineering; Northwest University for Nationalities; Lanzhou 730030 People's Republic of China