1. Institute of Molecular Science Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan 030006 P. R. China), E-mail: han
2. College of Chemical Engineering and Materials Science Quanzhou Normal University Quanzhou 362000 P. R. China
3. School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 P. R. China