KSCN对钒电池正极反应动力学及电池性能的影响  

Effects of KSCN on Kinetic Characters of the Positive Couple and Performance for Vanadium Redox Flow Battery

作　　者：刘建国[1] 石冬[1,2] 门阅[2] 严川伟[1] 

机构地区：[1]中国科学院金属研究所 金属腐蚀与防护国家重点实验室,辽宁沈阳110016 [2]东北大学理学院,辽宁沈阳110004

出　　处：《电化学》2009年第2期206-211,共6页Journal of Electrochemistry

基　　金：辽宁省自然科学基金(No.20071010)资助

摘　　要：应用循环伏安、交流阻抗(EIS)等方法,研究了硫氰酸钾(KSCN)添加剂对石墨电极上(正极)钒电池电对(VO2+/VO2+)动力学特征及电池性能的影响.结果表明:1)KSCN的添加提高了VO2+/VO2+电对氧化峰的峰电流,但对还原峰的影响很小;2)添加KSCN,增加了充放电电量,提高了钒电池中活性物质的利用效率;3)VO2+/VO2+电对的速率常数K0,随着KSCN浓度的增加而逐渐增大.In order to improve the reaction activity of VO2^＋/VO^2＋ and the battery performance of Vanadium redox flow battery, different concentration of potassium sulfocyanates KSCN were added into 0. 1 moL/L VOSO4/ H2SO4 solution, and the kinetic characters of electrochemical reaction of VO2 ^＋/VO^2＋ was studied by CV and EIS. The results showed that the addition of KSCN could improve the oxidative peak current value of positive couple VO ^2＋/VO2^＋ reaction, but had little influence in the reductive peak. The addition of KSCN decreased the impedance at 1.0 V. And the value of standard rate constant k0 was also improved with the concentration of KSCN increased. The total coulomb during the charge and discharge processes increased after the addition of KSCN, which means that the usage efficiency of active species in the VRB solution was improved.

关 键 词：钒电池 正极电对 动力学特征 KSCN 电池性能 

分 类 号：TM912.1[电气工程—电力电子与电力传动]