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Mass transport and active area of porous Pt/Ti electrodes for the Zn-Ce redox flow battery determined from limiting current measurements

Mass transport and active area of porous Pt/Ti electrodes for the Zn-Ce redox flow battery determined from limiting current measurements
Mass transport and active area of porous Pt/Ti electrodes for the Zn-Ce redox flow battery determined from limiting current measurements
The conversion of soluble cerium redox species in the zinc-cerium redox flow battery and other electrochemical processes can be carried out at planar and porous platinised titanium electrodes. The active area, current density, mass transfer coefficient and linear electrolyte flow velocity through these structures have a direct influence on the reaction yield and the relationship between cell potential and operational current density during charge and discharge of a flow battery. A quantitative and practical characterization of the reaction environment at these electrodes is required. The volumetric mass transfer coefficient, kmAekmAe has been calculated for diverse electrode structures from limiting current measurements for Ce(IV) ion reduction in a laboratory, rectangular channel flow cell. This factor can be used to predict fractional conversion and required electrode dimensions. Platinised titanium felt shows superior kmAekmAe values compared to other materials and is a practical, high performance electrode for the Ce(III)/Ce(IV) ion redox reaction.
0013-4686
154-166
Arenas Martinez, Luis
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2
Arenas Martinez, Luis
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2

Arenas Martinez, Luis, Ponce De Leon Albarran, Carlos and Walsh, Frank C. (2016) Mass transport and active area of porous Pt/Ti electrodes for the Zn-Ce redox flow battery determined from limiting current measurements. Electrochimica Acta, 221, 154-166. (doi:10.1016/j.electacta.2016.10.097).

Record type: Article

Abstract

The conversion of soluble cerium redox species in the zinc-cerium redox flow battery and other electrochemical processes can be carried out at planar and porous platinised titanium electrodes. The active area, current density, mass transfer coefficient and linear electrolyte flow velocity through these structures have a direct influence on the reaction yield and the relationship between cell potential and operational current density during charge and discharge of a flow battery. A quantitative and practical characterization of the reaction environment at these electrodes is required. The volumetric mass transfer coefficient, kmAekmAe has been calculated for diverse electrode structures from limiting current measurements for Ce(IV) ion reduction in a laboratory, rectangular channel flow cell. This factor can be used to predict fractional conversion and required electrode dimensions. Platinised titanium felt shows superior kmAekmAe values compared to other materials and is a practical, high performance electrode for the Ce(III)/Ce(IV) ion redox reaction.

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Revised Arenas et al - 11 Oct 2016 for eprints.pdf - Accepted Manuscript
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Accepted/In Press date: 15 October 2016
e-pub ahead of print date: 17 October 2016
Published date: 10 December 2016
Organisations: Energy Technology Group

Identifiers

Local EPrints ID: 401439
URI: http://eprints.soton.ac.uk/id/eprint/401439
ISSN: 0013-4686
PURE UUID: 0e77db82-9bdc-4dff-a765-7537a4e3e2a6
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 05 Dec 2016 09:21
Last modified: 17 Dec 2019 06:36

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