1. Key Laboratory of Molecular Nanostructure and Nanotechnology; Beijing National Laboratory for Molecular Science; Institute of Chemistry; Chinese Academy of Sciences (CAS); Beijing 100190 P. R. China
2. College of Environmental Science and Engineering; Hunan University; Changsha 410082 P. R. China
3. Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences (CAS); Beijing 100190 P. R. China
4. Shandong Wina Green Power Co. Ltd.; Shouguang 262705 P. R. China