1. State Key Laboratory for Environmental-friendly Energy Materials
2. Southwest University of Science and Technology
3. Mianyang 621010
4. China
5. Institut Jean Lamour
6. School of Physics and Optoelectronics
7. Xiangtan University
8. Xiangtan 411105
9. Center for Green Research on Energy and Environmental Materials
10. National Institute for Materials Science
11. Tsukuba 305-0047
12. Japan
13. UMR 7198-CNRS
14. Université de Lorraine
15. Nancy 54011
16. France