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The importance of cell geometry and electrolyte properties to the cell potential of Zn-Ce hybrid flow batteries

The importance of cell geometry and electrolyte properties to the cell potential of Zn-Ce hybrid flow batteries
The importance of cell geometry and electrolyte properties to the cell potential of Zn-Ce hybrid flow batteries
This paper considers the effects of electrolyte resistivity and inter-electrode gap on the simulated cell potential of an idealized Zn-Ce unit flow cell as a function of the applied current density. The thermodynamic, kinetic and ohmic components of cell potential in a redox flow battery (RFB) are taken into account. This is important in the Zn-Ce RFB, where the positive electrode reaction tends to govern cell performance. The ionic conductivity of methanesulfonic acid (MSA) and typical electrolytes reported in the literature were measured as a function of MSA concentration and temperature. At 50 °C, the ionic resistivity of the positive and negative electrolytes is 3.0 ? cm and 4.8 ? cm respectively, for the most favourable electrolyte composition. The simulated cell potential showed that high surface-area electrodes were beneficial to the cell performance, while electrolytes containing 0.8 mol dm–3 Ce(III) and 1.5 mol dm–3 Zn(II) produced the lowest ohmic drop, which decreased at higher temperatures. The activation overpotential and internal resistance can provide the main potential loss components, depending on electrolyte composition, cell design and electrode materials. The effect of cell geometry on the cell potential was also assessed, larger inter-electrode gaps significantly increasing potential losses.
0013-4651
A5170-A5179
Arenas, Luis Fernando
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Arenas, Luis Fernando
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c

Arenas, Luis Fernando, Walsh, Frank and Ponce de Leon, Carlos (2016) The importance of cell geometry and electrolyte properties to the cell potential of Zn-Ce hybrid flow batteries. [in special issue: JES Focus Issue on Redox Flow Batteries-Reversiblie Fuel Cells] Journal of the Electrochemical Society, 163 (1), A5170-A5179. (doi:10.1149/2.0261601jes).

Record type: Article

Abstract

This paper considers the effects of electrolyte resistivity and inter-electrode gap on the simulated cell potential of an idealized Zn-Ce unit flow cell as a function of the applied current density. The thermodynamic, kinetic and ohmic components of cell potential in a redox flow battery (RFB) are taken into account. This is important in the Zn-Ce RFB, where the positive electrode reaction tends to govern cell performance. The ionic conductivity of methanesulfonic acid (MSA) and typical electrolytes reported in the literature were measured as a function of MSA concentration and temperature. At 50 °C, the ionic resistivity of the positive and negative electrolytes is 3.0 ? cm and 4.8 ? cm respectively, for the most favourable electrolyte composition. The simulated cell potential showed that high surface-area electrodes were beneficial to the cell performance, while electrolytes containing 0.8 mol dm–3 Ce(III) and 1.5 mol dm–3 Zn(II) produced the lowest ohmic drop, which decreased at higher temperatures. The activation overpotential and internal resistance can provide the main potential loss components, depending on electrolyte composition, cell design and electrode materials. The effect of cell geometry on the cell potential was also assessed, larger inter-electrode gaps significantly increasing potential losses.

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e-pub ahead of print date: 17 November 2015
Published date: 2016
Organisations: Energy Technology Group

Identifiers

Local EPrints ID: 386382
URI: http://eprints.soton.ac.uk/id/eprint/386382
ISSN: 0013-4651
PURE UUID: 144719ce-8cb7-413c-b539-6693e2f83196
ORCID for Carlos Ponce de Leon: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 01 Feb 2016 11:34
Last modified: 17 Dec 2019 01:46

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