1. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, P. R. China
2. Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion, Xiangtan 411201, P. R. China
3. The State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources, Kunming, Yunnan 650503, P. R. China