Electrochemical impedance spectroscopy study of Ce(IV) with aminopolycarboxylate ligands for redox flow batteries applications

被引:20
作者
Modiba, Portia [1 ,2 ]
Matoetoe, Mangaka [3 ]
Crouch, Andrew M. [2 ,4 ]
机构
[1] Univ Glasgow, Dept Chem, Glasgow G12 8QQ, Lanark, Scotland
[2] Univ Stellenbosch, Dept Chem, ZA-7602 Stellenbosch, South Africa
[3] Cape Peninsula Univ Technol, Dept Chem, ZA-8001 Zonnebloem, South Africa
[4] Univ Witwatersrand, Fac Sci, ZA-2050 Johannesburg, South Africa
基金
新加坡国家研究基金会;
关键词
Electrochemical impedance spectroscopy; Cyclic voltammetry; Redox flow battery; Cerium complexes; Aminopolycarboxylate ligands; Charge/discharge; ENERGY-STORAGE; ACID; KINETICS; COMPLEXES; OXIDATION; COUPLES; EDTA; DTPA; PHENANTHROLINE; CARBON;
D O I
10.1016/j.jpowsour.2012.01.004
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electrochemical behaviour of cerium with ethylenediamine tetraacetic acid (Ce(IV)-EDTA), ethylenediamine disuccinate (Ce(IV)-EDDS), nitrilotriacetic acid (Ce(IV)-NTA) and diethylenetriamine pentaacetic acid (Ce(IV)-DTPA on a platinum electrode were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) for redox flow batteries (RFB) application. The EIS results confirm the results from CV and were in good agreement with obtained data. Ce(IV)-DTPA results show the least resistance and faster electron transfer compared to Ce(IV)-EDTA, Ce(IV)-EDDS, Ce(IV)-NTA. The diffusion coefficient of 1.1 x 10(-6) cm(2) s(-1), rate constant of 1.6 x 10(-4) cm s(-1), electrolyte resistance of 1.2 Omega were obtained. A single cell charge/discharge performance of Ce(IV)-DTPA shows as promise for possible application in RFB systems, because of the higher energy and voltage achieved. Therefore. Ce(IV)-DTPA will be a suitable RFB electrolyte compared to Ce(IV), Ce(IV)-EDTA, Ce(IV)-EDDS and Ce(IV)-NTA due to most favoured reversibility and electrochemical properties. (C) 2012 Elsevier B.V. All rights reserved.
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页码:1 / 9
页数:9
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