1. College of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, P. R. China
2. State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
3. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China