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《Chinese Journal of Inorganic Chemistry》 2012-05
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Influence of Mn~(2+) Concentration on the Electrochemical Behavior of the Anolyte for Vanadium Redox Flow Batteries

HUANG Fei1 WANG Gui-Xin*,1 YAN Kang-Ping1 LUO Dong-Mei2(1College of Chemical Engineering,Sichuan University,Chengdu 610065,China)(2PanGang Group Panzhihua Iron & Steel Research Institute,Panzhihua,Sichuan 617000,China)  
Metal ions in the electrolyte will affect the electrochemical performance of vanadium redox flow batteries(VRBs).The influence of Mn2+ concentration in the anolyte on the redox process of V(Ⅴ)/V(Ⅳ) couple has been investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).It is found that Mn2+ doesn′t cause a side reaction,but greatly affects the electrochemical performance of V(Ⅴ)/V(Ⅳ)redox reaction,including reaction activity,reversibility of electrode reaction,vanadium ion diffusion,and charge transfer reaction.The results from CV show that the reversibility and the reaction activity of V(Ⅴ)/V(Ⅳ) couple can be improved as the Mn2+ concentration ranges from 0.04 to 0.13 g·L-1.The vanadium ion diffusion coefficient increases from 8.89×10-7-1.098×10-6 in the reference anolyte to 1.302×10-6-1.800×10-6 cm2·s-1,an increase of -60%.EIS investigation indicates that the electrode reaction resistance and interfacial resistance of V(Ⅴ)/V(Ⅳ) couple have a slight increase when the Mn2+ concentration is no more than 0.04 g·L-1.When the Mn2+ concentration reaches 0.07 g·L-1,the values of these resistances are 25%-28% higher than those in the reference anolyte.Considering the results from CV and EIS,Mn2+ has different adverse effects on the electrode reaction,but Mn2+ with proper concentration is beneficial to improve the diffusion of vanadium ions.
【Fund】: 四川大学青年基金(No.07046);; 攀枝花钢铁研究院(No.11H0762)资助项目
【CateGory Index】: TM912
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