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The influence of operational parameters on the performance of an undivided zinc–cerium flow battery

The influence of operational parameters on the performance of an undivided zinc–cerium flow battery
The influence of operational parameters on the performance of an undivided zinc–cerium flow battery
An undivided zinc–cerium redox flow battery was studied under a wide range of operational conditions, including: (i) electrolyte composition; the concentrations of ([Zn2+], [Ce3+] and [H+]), (ii) current density (0–80 mA cm?2), (iii) electrolyte flow linear velocity (0.64–7.0 cm s?1) and (iv) temperature (20–60 ?C). The charge efficiency increased at higher current densities and at higher electrolyte flow velocities. Unlike the divided zinc–cerium system, the charge–discharge performance decreased at higher temperature, since oxygen evolution became increasingly favored at the positive electrode. The use of a low acid concentration led to a poor conversion of Ce(III) to Ce(IV) ions during the discharge cycle. Mixed electrolytes containing methanesulfonate and sulfate anions have been evaluated at a high Ce(III) ion concentration, e.g. 0.4 mol dm?3. After charging the battery for 4 h, the conversion of Ce(III) to Ce(IV) ions became less efficient over time due to a greater fraction of the current being used in oxygen evolution. Critical aspects for improvements in the battery performance are considered.
0013-4686
7-14
Leung, P.K.
0a85d602-5141-41e5-8dbd-12873d5b9d4a
Ponce de León Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Leung, P.K.
0a85d602-5141-41e5-8dbd-12873d5b9d4a
Ponce de León Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2

Leung, P.K., Ponce de León Albarran, Carlos and Walsh, F.C. (2012) The influence of operational parameters on the performance of an undivided zinc–cerium flow battery. Electrochimica Acta, 80, 7-14. (doi:10.1016/j.electacta.2012.06.074).

Record type: Article

Abstract

An undivided zinc–cerium redox flow battery was studied under a wide range of operational conditions, including: (i) electrolyte composition; the concentrations of ([Zn2+], [Ce3+] and [H+]), (ii) current density (0–80 mA cm?2), (iii) electrolyte flow linear velocity (0.64–7.0 cm s?1) and (iv) temperature (20–60 ?C). The charge efficiency increased at higher current densities and at higher electrolyte flow velocities. Unlike the divided zinc–cerium system, the charge–discharge performance decreased at higher temperature, since oxygen evolution became increasingly favored at the positive electrode. The use of a low acid concentration led to a poor conversion of Ce(III) to Ce(IV) ions during the discharge cycle. Mixed electrolytes containing methanesulfonate and sulfate anions have been evaluated at a high Ce(III) ion concentration, e.g. 0.4 mol dm?3. After charging the battery for 4 h, the conversion of Ce(III) to Ce(IV) ions became less efficient over time due to a greater fraction of the current being used in oxygen evolution. Critical aspects for improvements in the battery performance are considered.

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e-pub ahead of print date: 14 June 2012
Organisations: Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 348255
URI: http://eprints.soton.ac.uk/id/eprint/348255
ISSN: 0013-4686
PURE UUID: 016d167b-21d0-4297-a754-4cf1c9eb3151
ORCID for Carlos Ponce de León Albarran: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 11 Feb 2013 11:24
Last modified: 10 Dec 2019 01:44

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Author: P.K. Leung
Author: F.C. Walsh

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