1. School of Materials Science & Engineering
2. Shaanxi University of Science and Technology
3. Xi'an
4. China
5. State Key Laboratory of Solid Lubrication
6. College of Chemistry and Chemical Engineering
7. Lanzhou University
8. Lanzhou 730000
9. School of Mechatronic Engineering
10. Lanzhou Jiaotong University
11. Lanzhou 730070
12. Lanzhou Institute of Chemical Physics
13. Chinese Academy of Science