An electrochemical study on the positive electrode side of the zinc-cerium hybrid redox flow battery

被引：34

作者：

Nikiforidis, Georgios ^{[1
]}

Berlouis, Leonard ^{[1
]}

Hall, David ^{[2
]}

Hodgson, David ^{[3
]}

机构：

[1] Univ Strathclyde, Dept Pure & Appl Chem, WestCHEM, Glasgow G1 1XL, Lanark, Scotland

[2] C Tech Innovat Ltd, Chester CH1 6EH, Cheshire, England

[3] UCL, Dept Chem Engn, Electrochem Innovat Lab, London WC1E 7JE, England

来源：

ELECTROCHIMICA ACTA | 2014年 / 115卷

关键词：

Cerium; Zn-Ce redox flow battery; Methanesulfonic acid; Pt-Ir electrodes; METHANESULFONIC-ACID; OXIDATION; PLATINUM; KINETICS; COUPLE; REGENERATION; PERFORMANCE; MECHANISM; HYDROGEN; SULFATE;

D O I：

10.1016/j.electacta.2013.09.081

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this study, the electrochemical behaviour of the Ce3+/4+ redox couple in methanesulfonic acid medium on various electrode substrates was investigated as a function of temperature. Carbon composite electrodes as well as platinum and platinum iridium coated electrodes were studied for their suitability in carrying out the Ce3+/4+ redox reaction. Cyclic voltammetry in 0.8 mol dm(-3) cerium and 4.5 mol dm(-3) methanesulfonic acid solution showed that elevated temperatures favoured the Ce3+/Ce4+ reaction on the various platinum and platinum-iridium coated substrates as well as on carbon composite surfaces. The latter electrodes showed better kinetics than the metal coatings but deteriorated badly under the high positive potentials required for the cerium reaction. The exchange current density (j(o)), obtained through Tafel extrapolation, polarisation resistance and electrochemical impedance spectroscopy measurements, increased with temperature over the range 25 degrees C to 60 degrees C. The Pt-Ir coatings gave the largest j(o) at 60 degrees C and appear best suited for use as the positive electrode in the Zn-Ce redox flow battery. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：621 / 629

页数：9

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