1. School of Chemistry Xiangtan University Xiangtan 411105 P. R. China
2. Hunan Engineering Technology Research Center of Vanadium Flow Battery and Energy Storage System Hunan Province Yinfeng New Energy Co, Ltd. Changsha 410019 P. R. China
3. College of Intelligent Science and Engineering Hunan Institute of Engineering Xiangtan 411104 P. R. China
4. School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 P. R. China
5. State Key Laboratory of High‐Efficiency and High‐Quality Conversion for Electric Power College of Electrical and Information Engineering Hunan University Changsha 410082 P. R. China