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Corrosion of the zinc negative electrode of zinc–cerium hybrid redox flow batteries in methanesulfonic acid

Corrosion of the zinc negative electrode of zinc–cerium hybrid redox flow batteries in methanesulfonic acid
Corrosion of the zinc negative electrode of zinc–cerium hybrid redox flow batteries in methanesulfonic acid
Corrosion of zinc in aqueous methanesulfonic acid has been evaluated over a wide range of concentrations of acid (0.5–5 mol dm-3), dissolved zinc (0.5–2 mol dm-3), and electrolyte temperature (22–50 °C). The corrosion rate of zinc, in terms of weight loss and the volume of hydrogen evolved, varied with time and it was found to be highly dependent on the surface state and electrolyte conditions. With an initial active layer of zinc present, the corrosion rate rapidly increased following a decline when the proton concentration in the solution decreased to ca. 0.56 mol dm-3. Organic and inorganic inhibitors were added to the electrolyte to suppress the zinc corrosion in 1 mol dm-3methanesulfonic acid. The strong adsorption and blocking effects of cationic organic adsorption inhibitors, such as cetyltrimethyl ammonium bromide and butyltriphenyl phosphonium chloride, led to a significant decrease in zinc corrosion over a 10 h immersion period. With the addition of indium and lead ions inhibitors, the zinc surface showed less activity. Zinc corrosion continued to a smaller extent in the presence of these metallic inhibitors during the first few hours, but the metallic layer of the inhibitors did not cover the surface completely resulting in continued hydrogen evolution and making the inhibitors less effective at longer times.
1025-1035
Leung, P.K.
0a85d602-5141-41e5-8dbd-12873d5b9d4a
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Recio, F.J.
c1569d6a-c8ca-4987-8313-01ef4c6cf776
Herrasti Gonzalez, P.
4b72d0e4-f391-421a-ae54-a9ba3f5632fc
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Leung, P.K.
0a85d602-5141-41e5-8dbd-12873d5b9d4a
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Recio, F.J.
c1569d6a-c8ca-4987-8313-01ef4c6cf776
Herrasti Gonzalez, P.
4b72d0e4-f391-421a-ae54-a9ba3f5632fc
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2

Leung, P.K., Ponce de Leon, Carlos, Recio, F.J., Herrasti Gonzalez, P. and Walsh, F.C. (2014) Corrosion of the zinc negative electrode of zinc–cerium hybrid redox flow batteries in methanesulfonic acid. Journal of Applied Electrochemistry, 44 (9), 1025-1035. (doi:10.1007/s10800-014-0714-y).

Record type: Article

Abstract

Corrosion of zinc in aqueous methanesulfonic acid has been evaluated over a wide range of concentrations of acid (0.5–5 mol dm-3), dissolved zinc (0.5–2 mol dm-3), and electrolyte temperature (22–50 °C). The corrosion rate of zinc, in terms of weight loss and the volume of hydrogen evolved, varied with time and it was found to be highly dependent on the surface state and electrolyte conditions. With an initial active layer of zinc present, the corrosion rate rapidly increased following a decline when the proton concentration in the solution decreased to ca. 0.56 mol dm-3. Organic and inorganic inhibitors were added to the electrolyte to suppress the zinc corrosion in 1 mol dm-3methanesulfonic acid. The strong adsorption and blocking effects of cationic organic adsorption inhibitors, such as cetyltrimethyl ammonium bromide and butyltriphenyl phosphonium chloride, led to a significant decrease in zinc corrosion over a 10 h immersion period. With the addition of indium and lead ions inhibitors, the zinc surface showed less activity. Zinc corrosion continued to a smaller extent in the presence of these metallic inhibitors during the first few hours, but the metallic layer of the inhibitors did not cover the surface completely resulting in continued hydrogen evolution and making the inhibitors less effective at longer times.

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Published date: 17 August 2014
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 371671
URI: http://eprints.soton.ac.uk/id/eprint/371671
PURE UUID: a00a8138-d101-487d-828d-1fdc76e859d3
ORCID for Carlos Ponce de Leon: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 12 Nov 2014 11:46
Last modified: 15 Mar 2024 03:22

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Contributors

Author: P.K. Leung
Author: F.J. Recio
Author: P. Herrasti Gonzalez
Author: F.C. Walsh

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