1. Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing, P. R. China
2. Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, P. R. China
3. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, P. R. China
4. Hitachi High-Tech (Shanghai) Co., Ltd, Shanghai, P. R. China
5. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, P. R. China