1. Institute of New Energy Materials
2. School of Materials Science and Engineering
3. Tianjin University
4. Tianjin 300072
5. P. R. China
6. National Synchrotron Radiation Laboratory
7. University of Science and Technology of China
8. Hefei
9. Shanghai Institute of Applied Physics
10. Shanghai Synchrotron Radiation Facility
11. Chinese Academia Science
12. Shanghai 201204