摘要
采用循环伏安法、线性扫描伏安法和交流阻抗技术分别研究了石墨电极在不同浓度的卤化钒电解液中的电化学性能,并研究了不同浓度电解液的黏度性质。结果表明：卤化钒电解液中当溴的浓度在1.0-1.5 mol/L时黏度为1.0×10^-3Pa·s左右,溶液的粘滞阻力较小;在石墨电极上的得到的循环伏安曲线氧化峰电流与还原峰电流之比约为1,且峰电位差较小,电极反应的可逆性较强;交流阻抗分析可知溶液电阻在此浓度范围内也较小,约为1Ω;交换电流密度和反应速率常数的计算结果表明,该电解液中溴浓度在1.0-1.5 mol/L时达到了最好的动力学性质。上述分析认为此浓度范围的电解液适合作为溴化钒氧化还原电池的正极电解液。
The electrode process of electrolytes with different bromide concentrations at a graphite electrode using cyclic voltammetry,linear polarization and impedance techniques are studied respectively.The results indicated that when the concentrations of bromine was 1.0-1.5 mol/L,the viscosity was around 1.0×10-3 Pa·s;the ratio of oxidation peak current to reduction peak current obtained from cyclic voltammograms was around 1,which showed a well reversibility;the resistance of the solutions obtained from alternating current impedance was less than others. The exchange current density and the reaction rate constants was calculated. It showed best kinetic property when the concentrations of bromine was 1.0-1.5 mol/L. Therefore, this concentration scale is suitable to be used as anode electrolyte.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2009年第4期52-55,共4页
Nonferrous Metals（Extractive Metallurgy)
关键词
液流电池
卤化钒
极化曲线
交流阻抗
Redox flow battery（RFB）
Vanadium halide
Linear Polarization
AC impedance spectroscopy
