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Zinc deposition and dissolution in methanesulfonic acid onto a carbon composite electrode as the negative electrode reactions in a hybrid redox flow battery

Leung, P.K., Ponce-de-León, C., Low, C.T.J. and Walsh, F.C. (2011) Zinc deposition and dissolution in methanesulfonic acid onto a carbon composite electrode as the negative electrode reactions in a hybrid redox flow battery Electrochimica Acta, 56, (18), pp. 6536-6546. (doi:10.1016/j.electacta.2011.04.111).

Record type: Article

Abstract

Electrodeposition and dissolution of zinc in methanesulfonic acid were studied as the negative electrode reactions in a hybrid redox flow battery. Cyclic voltammetry at a rotating disk electrode was used to characterize the electrochemistry and the effect of process conditions on the deposition and dissolution rate of zinc in aqueous methanesulfonic acid. At a sufficiently high current density, the deposition process became a mass transport controlled reaction. The diffusion coefficient of Zn2+ ions was 7.5 × 10?6 cm2 s?1. The performance of the zinc negative electrode in a parallel plate flow cell was also studied as a function of Zn2+ ion concentration, methanesulfonic acid concentration, current density, electrolyte flow rate, operating temperature and the addition of electrolytic additives, including potassium sodium tartarate, tetrabutylammonium hydroxide, and indium oxide. The current-, voltage- and energy efficiencies of the zinc-half cell reaction and the morphologies of the zinc deposits are also discussed. The energy efficiency improved from 62% in the absence of additives to 73% upon the addition of 2 × 10?3 mol dm?3 of indium oxide as a hydrogen suppressant. In aqueous methanesulfonic acid with or without additives, there was no significant dendrite formation after zinc electrodeposition for 4 h at 50 mA cm?2.

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Published date: 15 July 2011
Keywords: dendrite, electrodeposition, flow battery, methanesulfonic acid, zinc
Organisations: Engineering Science Unit

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Local EPrints ID: 342504
URI: http://eprints.soton.ac.uk/id/eprint/342504
ISSN: 0013-4686
PURE UUID: 0a772add-6f9b-44d8-9ae6-ff7ab40d2d09

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Date deposited: 04 Sep 2012 13:46
Last modified: 18 Jul 2017 05:28

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Contributors

Author: P.K. Leung
Author: C.T.J. Low
Author: F.C. Walsh

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