Kinetics study of transition metal complexes (Ce-DTPA, Cr-DTPA and V-DTPA) for redox flow battery applications

被引：21

作者：

Modiba, Portia ^{[1
,2
]}

Matoetoe, Mangaka ^{[3
]}

Crouch, Andrew M. ^{[4
]}

机构：

[1] Univ Stellenbosch, Dept Chem, ZA-7602 Stellenbosch, South Africa

[2] Univ Glasgow, Dept Chem, Glasgow G12 8QQ, Lanark, Scotland

[3] Cape Peninsula Univ Technol, Dept Chem, ZA-8001 Zonnebloem, South Africa

[4] Univ Witwatersrand, Fac Sci, ZA-2050 Johannesburg, South Africa

来源：

ELECTROCHIMICA ACTA | 2013年 / 94卷

基金：

新加坡国家研究基金会;

关键词：

Electrochemical impedance spectroscopy; Cyclic voltammetry; Redox flow battery; Ce(IV)-DTPA complex; Electrochemical kinetics; ELECTROCHEMICAL ENERGY-STORAGE; ACID; OXIDATION; COUPLES; EDTA; PHENANTHROLINE; REDUCTION; LIGANDS; CARBON; CE(IV);

D O I：

10.1016/j.electacta.2013.01.081

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electrochemical kinetics of Ce(IV), Cr(III) and V(IV) and their diethylenetriaminepentaacetic acid (DTPA) complexes are studied by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) on Pt-electrode. Kinetic parameters such as potential, limiting current, transfer coefficient, diffusion coefficients, and rate constants were examined. The EIS results confirm the results from CV and are in good agreement with the obtained experimental data. The Cr-DTPA complex rate constant of 2.1 x 10(-4) cm s(-1), diffusion coefficient of 1.9 x 10(-6) cm(2) s(-1) and the V-DTPA complex rate constant of 2.2 x 10(-4) cm s(-1) and diffusion coefficient of 4.9 x 10(-4) cm(2) s(-1) were obtained and compared with the Ce(IV)-DTPA complex. The Ce(IV)-DTPA complex appear to better satisfy the requirement of a suitable electrolyte for RFB applications than Cr(III)-DTPA and V(IV)-DTPA complexes. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：336 / 343

页数：8

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