Voltammetric studies of the mechanism of the oxygen reduction in alkaline media at the spinels Co3O4and NiCo2O4
Voltammetric studies of the mechanism of the oxygen reduction in alkaline media at the spinels Co3O4and NiCo2O4
The mechanism of O2 reduction at the spinels, Co3O4 and NiCo2O4, in KOH electrolyte is probed using voltammetry at rotating disc and rotating ring-disc electrodes by examination of the rotation rate dependent limiting currents. The analysis shows that the products and mechanisms at the two spinels are quite different. At the cobalt spinel, a substantial amount of the 2e? reduction product, H2O2, is formed while at NiCo2O4 the 4e? reduction strongly predominates. In terms of both the overpotential for reduction and its limiting current density, the mixed spinel is a substantially better electrocatalyst. It is proposed that the differences arise from an enhanced rate of O-O bond cleavage early in the reduction process at NiCo2O4.
alkaline electrolyte, oxygen reduction, RDE, RRDE, spinel
H884-H890
Sonmez, Turgut
b3c53645-b2fb-41fa-b893-48ab419df832
Thompson, Stephen
46677911-01d9-478e-ad98-87ac37cd56a6
Price, Stephen W.T.
42cf4966-68f0-443a-a933-d198f3dc60c2
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Russell, Andrea
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
3 August 2016
Sonmez, Turgut
b3c53645-b2fb-41fa-b893-48ab419df832
Thompson, Stephen
46677911-01d9-478e-ad98-87ac37cd56a6
Price, Stephen W.T.
42cf4966-68f0-443a-a933-d198f3dc60c2
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Russell, Andrea
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Sonmez, Turgut, Thompson, Stephen, Price, Stephen W.T., Pletcher, Derek and Russell, Andrea
(2016)
Voltammetric studies of the mechanism of the oxygen reduction in alkaline media at the spinels Co3O4and NiCo2O4.
Journal of the Electrochemical Society, 163 (10), .
(doi:10.1149/2.0111610jes).
Abstract
The mechanism of O2 reduction at the spinels, Co3O4 and NiCo2O4, in KOH electrolyte is probed using voltammetry at rotating disc and rotating ring-disc electrodes by examination of the rotation rate dependent limiting currents. The analysis shows that the products and mechanisms at the two spinels are quite different. At the cobalt spinel, a substantial amount of the 2e? reduction product, H2O2, is formed while at NiCo2O4 the 4e? reduction strongly predominates. In terms of both the overpotential for reduction and its limiting current density, the mixed spinel is a substantially better electrocatalyst. It is proposed that the differences arise from an enhanced rate of O-O bond cleavage early in the reduction process at NiCo2O4.
Text
NiCo2O4_Co3O4 echemacta.docx
- Accepted Manuscript
Text
J. Electrochem. Soc.-2016-Sönmez-H884-90.pdf
- Version of Record
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Accepted/In Press date: 25 July 2016
e-pub ahead of print date: 3 August 2016
Published date: 3 August 2016
Keywords:
alkaline electrolyte, oxygen reduction, RDE, RRDE, spinel
Organisations:
Electrochemistry
Identifiers
Local EPrints ID: 399929
URI: http://eprints.soton.ac.uk/id/eprint/399929
ISSN: 0013-4651
PURE UUID: 67425d4d-6e16-4553-b225-3e9721dfa951
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Date deposited: 02 Sep 2016 15:58
Last modified: 15 Mar 2024 02:58
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Contributors
Author:
Turgut Sonmez
Author:
Stephen Thompson
Author:
Stephen W.T. Price
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