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Effect of 1-Octanethiol as an electrolyte additive on the performance of the iron-air battery electrodes

Effect of 1-Octanethiol as an electrolyte additive on the performance of the iron-air battery electrodes
Effect of 1-Octanethiol as an electrolyte additive on the performance of the iron-air battery electrodes
It has recently been established that 1-octanethiol in the electrolyte can allow iron-electrodes to be discharged at higher rates. However, the effect of thiol additives on the air-electrode, has not yet been studied. The effect of solvated thiols on the surface positive electrode reaction is of prime importance if these are to be used in an iron-air battery. This work shows that the air-electrode catalyst is poisoned by the presence of octanethiol, with the oxygen reduction overpotential at the air-electrode increasing with time of exposure to the solution and increased 1-octanethiol concentration in the range 0-0.1 mol dm-3. Post-mortem XPS analysis were performed over the used air-electrodes suggesting the adsorption of sulphur-species over the catalyst surface, reducing its performance. Therefore, although sulphur-based additives may be suitable for nickel-iron batteries they are not recommended for iron-air batteries except in concentrations well below 10 ×10-3 mol dm-3.
iron-air-battery, air-electrode, iron-electrode, 1-octanethiol
1432-8488
McKerracher, R.D.
f5f9f0e7-a256-4714-b752-e3bb8dab03fc
Figueredo Rodriguez, H.A.
e49f1681-45b4-4828-a217-9a507bb68791
Dimogiannis, K.
89824d59-634a-4f03-8b42-721cf6791ee3
Alegre, C.
b57abb63-73ed-42e7-8510-08d73917a9c4
Villanueva-Martinez, N. I.
fac958a5-7e42-47a0-84f5-b5231f9cc79e
Lázaro, M. J.
831b729f-fc34-4d1b-a5e6-5df7f35fcd16
Baglio, V.
5d62998b-2e86-4f02-b0be-f544f0ae6f02
Aricò, A.S.
aab629f8-1ee4-4e27-93a3-b6e4222d9b8d
Ponce De Leon, C.
508a312e-75ff-4bcb-9151-dacc424d755c
McKerracher, R.D.
f5f9f0e7-a256-4714-b752-e3bb8dab03fc
Figueredo Rodriguez, H.A.
e49f1681-45b4-4828-a217-9a507bb68791
Dimogiannis, K.
89824d59-634a-4f03-8b42-721cf6791ee3
Alegre, C.
b57abb63-73ed-42e7-8510-08d73917a9c4
Villanueva-Martinez, N. I.
fac958a5-7e42-47a0-84f5-b5231f9cc79e
Lázaro, M. J.
831b729f-fc34-4d1b-a5e6-5df7f35fcd16
Baglio, V.
5d62998b-2e86-4f02-b0be-f544f0ae6f02
Aricò, A.S.
aab629f8-1ee4-4e27-93a3-b6e4222d9b8d
Ponce De Leon, C.
508a312e-75ff-4bcb-9151-dacc424d755c

McKerracher, R.D., Figueredo Rodriguez, H.A., Dimogiannis, K., Alegre, C., Villanueva-Martinez, N. I., Lázaro, M. J., Baglio, V., Aricò, A.S. and Ponce De Leon, C. (2020) Effect of 1-Octanethiol as an electrolyte additive on the performance of the iron-air battery electrodes. Journal of Solid State Electrochemistry. (In Press)

Record type: Article

Abstract

It has recently been established that 1-octanethiol in the electrolyte can allow iron-electrodes to be discharged at higher rates. However, the effect of thiol additives on the air-electrode, has not yet been studied. The effect of solvated thiols on the surface positive electrode reaction is of prime importance if these are to be used in an iron-air battery. This work shows that the air-electrode catalyst is poisoned by the presence of octanethiol, with the oxygen reduction overpotential at the air-electrode increasing with time of exposure to the solution and increased 1-octanethiol concentration in the range 0-0.1 mol dm-3. Post-mortem XPS analysis were performed over the used air-electrodes suggesting the adsorption of sulphur-species over the catalyst surface, reducing its performance. Therefore, although sulphur-based additives may be suitable for nickel-iron batteries they are not recommended for iron-air batteries except in concentrations well below 10 ×10-3 mol dm-3.

Text
Effect of 1-Octanethiol as an Electrolyte Additive on the Performance of the IAB - Accepted Manuscript
Restricted to Repository staff only until 21 June 2021.
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More information

Accepted/In Press date: 21 June 2020
Keywords: iron-air-battery, air-electrode, iron-electrode, 1-octanethiol

Identifiers

Local EPrints ID: 441994
URI: http://eprints.soton.ac.uk/id/eprint/441994
ISSN: 1432-8488
PURE UUID: c7e4cf80-7bff-4f6a-b0c6-8f1d84779b4f
ORCID for C. Ponce De Leon: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 03 Jul 2020 16:31
Last modified: 18 Feb 2021 17:04

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