金属有机框架衍生的C-Bi/CC电极制备及其在铁铬液流电池中的电化学性能  

Fabrication of metal-organic framework-derived C-Bi/CC electrode materials and their electrochemical properties in ICRFB

作　　者：周洋 韩培玉 牛迎春 徐春明[1] 徐泉[1] ZHOU Yang;HAN Peiyu;NIU Yingchun;XU Chunming;XU Quan(China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京),北京102249

出　　处：《储能科学与技术》2024年第2期381-389,共9页Energy Storage Science and Technology

基　　金：国家自然科学基金青年项目(22308380,22308378)。

摘　　要：电极是铁铬液流电池的重要组成部分,是电解液中活性组分发生电化学反应的场所。理想的电极材料应具备高电导率、大比表面积、高电化学活性、低成本等特性,而目前的电极材料往往不能兼顾。金属有机框架(MOF)兼具高导电性、高催化性能的优点,能够为电化学反应提供更多的活性位点,因此被广泛应用在电极材料中。此项工作通过水热法制备了以碳布负载Bi-MOF为前驱体(Bi-MOF/CC)的铋基碳布(CC)电极(C-Bi/CC)。通过探究金属盐的添加量与电极性能的耦合关系,提升了电极的性能,结果显示,使用90 mg金属盐的电极样品极化电阻仅1.069Ω,相较于原始碳布降低了8.5%、Cr3+还原过电位为0.25 V,使用普通碳布作为正极,改性过的电极作为铁铬液流电池负极进行电池循环性能测试,在电流密度为80 mA/cm2时能量效率达89.7%,库仑效率达97.2%,电压效率达92.3%;在电流密度为140 mA/cm2时能量效率达到83.8%,库仑效率达98.1%,电压效率达85.5%。The electrode is an important part of the iron-chromium flow battery,serving as the site where the active components in the electrolyte undergo electrochemical reactions.The ideal electrode material should have high conductivity,large specific surface area,high electrochemical activity,low cost,among other characteristics.However,current electrode materials often lack a balance of these characteristics.Metal-organic frameworks(MOFs)combine their advantages of high conductivity and high catalytic performance,providing additional active sites for electrochemical reactions and finding widespread use in electrode materials.Herein,bismuth-based carbon cloth(CC)electrodes(C-Bi/CC)with carbon cloth-supported Bi-MOF as a precursor(Bi-MOF/CC)were prepared using a hydrothermal method.The electrode performance was improved by exploring the coupling correlation between the addition of metal salts and the electrode performance.The results showed that the electrode sample using 90 mg of metal salt and the ordinary carbon cloth as the positive electrode exhibited the best electrochemical performance,with a reduced polarization resistance of 1.069Ω(an 8.5%reduction),an enhanced electrochemical active area,a low Cr3+reduction overpotential of 0.25 V(a 59.7%decrease).The modified electrode was used as the negative electrode of the iron-chromium flow battery for the battery cycling performance test.At a current density of 80 mA/cm2,the energy efficiency reached 89.7%,the Coulombic efficiency was 97.2%,and the voltage efficiency was 92.3%.At a current density of 140 mA/cm2,the energy efficiency remained high at 83.8%,with the Coulomb efficiency reaching 98.1%and the voltage efficiency reaching 85.5%.

关 键 词：铁铬液流电池 电极材料 电化学性能 能量效率 

分 类 号：TQ02[化学工程]