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Electrochemical study of TiO2 in aqueous AlCl3 electrolyte via vacuum impregnation for superior high-rate electrode performance

Electrochemical study of TiO2 in aqueous AlCl3 electrolyte via vacuum impregnation for superior high-rate electrode performance
Electrochemical study of TiO2 in aqueous AlCl3 electrolyte via vacuum impregnation for superior high-rate electrode performance
This communication elucidates the charge storage mechanism of a TiO2 electrode in 1 mol dm-3 AlCl3 for use in aqueous-ion batteries. Cyclic voltammetry studies suggest a surface contribution to charge storage and that cycle life can be improved by limiting the potential ≥ -1.0 V vs SCE. In order to enhance this surface contribution, a simple vacuum impregnation technique was employed to improve electrode-electrolyte contact. This resulted in a significant improvement in the high rate performance of TiO2, where a capacity of 15 mA h g-1 was maintained at the very high specific current of 40 A g-1, a decrease of only 25% from when the electrode was cycled at 1 A g-1. The vacuum impregnation process was also applied to copper-hexacyanoferrate, envisaged as a possible positive electrode, again resulting in significant improvements to high-rate performance. This demonstrates the potential for using this simple technique for improving electrode performance in other aqueous electrolyte battery systems.
aqueous aluminium ion battery
2524-4469
Holland, A.W.
e58ebfdb-e31a-4962-bd40-530cd8ee4cb6
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Zerey, A.
a0566ebf-4ca8-4861-9724-f9cf2bba0939
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Wills, Richard
60b7c98f-eced-4b11-aad9-fd2484e26c2c
Holland, A.W.
e58ebfdb-e31a-4962-bd40-530cd8ee4cb6
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Zerey, A.
a0566ebf-4ca8-4861-9724-f9cf2bba0939
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Wills, Richard
60b7c98f-eced-4b11-aad9-fd2484e26c2c

Holland, A.W., Cruden, Andrew, Zerey, A., Hector, Andrew L. and Wills, Richard (2019) Electrochemical study of TiO2 in aqueous AlCl3 electrolyte via vacuum impregnation for superior high-rate electrode performance. BMC Energy, 1, [10]. (doi:10.1186/s42500-019-0010-9).

Record type: Article

Abstract

This communication elucidates the charge storage mechanism of a TiO2 electrode in 1 mol dm-3 AlCl3 for use in aqueous-ion batteries. Cyclic voltammetry studies suggest a surface contribution to charge storage and that cycle life can be improved by limiting the potential ≥ -1.0 V vs SCE. In order to enhance this surface contribution, a simple vacuum impregnation technique was employed to improve electrode-electrolyte contact. This resulted in a significant improvement in the high rate performance of TiO2, where a capacity of 15 mA h g-1 was maintained at the very high specific current of 40 A g-1, a decrease of only 25% from when the electrode was cycled at 1 A g-1. The vacuum impregnation process was also applied to copper-hexacyanoferrate, envisaged as a possible positive electrode, again resulting in significant improvements to high-rate performance. This demonstrates the potential for using this simple technique for improving electrode performance in other aqueous electrolyte battery systems.

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Aqueous Aluminium battery - Accepted Manuscript
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Accepted/In Press date: 4 December 2019
e-pub ahead of print date: 24 December 2019
Keywords: aqueous aluminium ion battery

Identifiers

Local EPrints ID: 436818
URI: http://eprints.soton.ac.uk/id/eprint/436818
ISSN: 2524-4469
PURE UUID: accd22b8-c5b9-4c62-8b9d-73ac321ce300
ORCID for Andrew Cruden: ORCID iD orcid.org/0000-0003-3236-2535
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163
ORCID for Richard Wills: ORCID iD orcid.org/0000-0002-4805-7589

Catalogue record

Date deposited: 10 Jan 2020 17:31
Last modified: 22 Nov 2021 03:03

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Contributors

Author: A.W. Holland
Author: Andrew Cruden ORCID iD
Author: A. Zerey
Author: Richard Wills ORCID iD

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