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

Georgios Nikiforidis, Leonard Berlouis, David Hall, David Hodgson

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In this study, the electrochemical behaviour of the Ce(III)/Ce(IV) redox couple in methanesulfonic acid medium on various electrode substrates was investigated as a function of temperature. Carbon composite electrodes as well as Pt and Pt-Ir coated electrodes were studied for their suitability in carrying out the Ce3+/Ce4+ 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 (io), obtained through Tafel extrapolation, polarisation resistance and electrochemical impedance spectroscopy measurements, increased with temperature over the range 25°C to 60°C. The Pt-Ir coatings gave the largest io at 60°C and appear best suited for use as the positive electrode in the Zn-Ce redox flow battery.
LanguageEnglish
Pages621-629
Number of pages9
JournalElectrochimica Acta
Volume115
Early online date24 Oct 2013
DOIs
Publication statusPublished - 1 Jan 2014

Fingerprint

Cerium
Zinc
Electrodes
Platinum
Carbon
Iridium
Metal coatings
Acids
Redox reactions
Composite materials
Substrates
Electrochemical impedance spectroscopy
Extrapolation
Temperature
Cyclic voltammetry
Current density
Flow batteries
Polarization
Coatings
Kinetics

Keywords

  • Cerium
  • Zn-Ce redox flow battery
  • methanesulfonic aci
  • Pt-Ir electrodes

Cite this

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abstract = "In this study, the electrochemical behaviour of the Ce(III)/Ce(IV) redox couple in methanesulfonic acid medium on various electrode substrates was investigated as a function of temperature. Carbon composite electrodes as well as Pt and Pt-Ir coated electrodes were studied for their suitability in carrying out the Ce3+/Ce4+ 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 (io), obtained through Tafel extrapolation, polarisation resistance and electrochemical impedance spectroscopy measurements, increased with temperature over the range 25°C to 60°C. The Pt-Ir coatings gave the largest io at 60°C and appear best suited for use as the positive electrode in the Zn-Ce redox flow battery.",
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An electrochemical study on the positive electrode side of the zinc–cerium hybrid redox flow battery. / Nikiforidis, Georgios; Berlouis, Leonard; Hall, David; Hodgson, David.

In: Electrochimica Acta, Vol. 115, 01.01.2014, p. 621-629.

Research output: Contribution to journalArticle

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T1 - An electrochemical study on the positive electrode side of the zinc–cerium hybrid redox flow battery

AU - Nikiforidis, Georgios

AU - Berlouis, Leonard

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N2 - In this study, the electrochemical behaviour of the Ce(III)/Ce(IV) redox couple in methanesulfonic acid medium on various electrode substrates was investigated as a function of temperature. Carbon composite electrodes as well as Pt and Pt-Ir coated electrodes were studied for their suitability in carrying out the Ce3+/Ce4+ 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 (io), obtained through Tafel extrapolation, polarisation resistance and electrochemical impedance spectroscopy measurements, increased with temperature over the range 25°C to 60°C. The Pt-Ir coatings gave the largest io at 60°C and appear best suited for use as the positive electrode in the Zn-Ce redox flow battery.

AB - In this study, the electrochemical behaviour of the Ce(III)/Ce(IV) redox couple in methanesulfonic acid medium on various electrode substrates was investigated as a function of temperature. Carbon composite electrodes as well as Pt and Pt-Ir coated electrodes were studied for their suitability in carrying out the Ce3+/Ce4+ 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 (io), obtained through Tafel extrapolation, polarisation resistance and electrochemical impedance spectroscopy measurements, increased with temperature over the range 25°C to 60°C. The Pt-Ir coatings gave the largest io at 60°C and appear best suited for use as the positive electrode in the Zn-Ce redox flow battery.

KW - Cerium

KW - Zn-Ce redox flow battery

KW - methanesulfonic aci

KW - Pt-Ir electrodes

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