应用于氧化还原电池的Fe^(3+)/Fe^(2+)电解液研究  

Study of Fe^(3+)/ Fe^(2+)electrolyte in redox battery

作　　者：张清[1] 周德璧[1] 秦牡兰[2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《应用化工》2014年第2期273-276,共4页Applied Chemical Industry

基　　金：中南大学中央高校基本科研业务费专项资金资助(2013zzts175)

摘　　要：以Fe(Ⅲ)/Fe(Ⅱ)为正极电解液的氧化还原电池,用循环伏安、交流阻抗、充放电等方法研究了在硫酸体系中的电化学行为。结果显示,Fe(Ⅲ)/Fe(Ⅱ)反应是准可逆过程,当硫酸的浓度为0.50 mol/L时,峰电流最大,Fe(Ⅱ)扩散系数Dc为2.276×10-6cm2/s;在0.37 V下的电化学极化阻抗为2.238Ω/cm2;与锌溶液组成电池,在20 mA/cm2进行循环充放电,充电电压在1.65~1.72 V,放电电压在1.11~1.25 V,电流效率为80%~97%,电压效率为65%~75%,能持续稳定循环110次。The redox flow cell in which Fe （ Ⅲ ）/Fe （ Ⅱ） was used as athodic electrolyte, the electrochemical behaviour of redox reaction of Fe（ Ⅲ ）/Fe（ Ⅱ） in sulfuric acid was investigated by means of cyclic voltammetry, impedance spectroscopies and charge-discharge. Result indicated that Fe（ Ⅲ）/Fe（ Ⅱ ） redox reaction was quasi reversible. The diffusion coefficient for Fe（ Ⅱ） was 2. 276 ×10 ^-6 cm2/s,the electrochemical impedance was 2. 238 Ω/cm^2 under 0.37 V. A Zn-Fe battery was assemble with Fe（ Ⅲ）/Fe （Ⅱ） -sulfuric acid positive species and Zn/Zn （ Ⅱ） -methanesulfonic acid negative species. The cell voltage in charged state was 1.65 - 1.72 V and discharge voltage reached up to 1.11 - 1.25 V. The coulombic and vohage efficiency were 80% - 97% and 65% - 75%, and it showed a good cyclic charge-discharge performance ,which indicates that ferrous sulfate has a promise application prospect in redox flow cell.

关 键 词：氧化还原 硫酸亚铁 电化学 

分 类 号：TQ138.1[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]