Influence of Pretreatment on Kinetics at Carbon Electrodes and Consequences for Flow Battery Performance

Buckley, D. N. and Bourke, A. and Lynch, R. P. and Quill, N. and Miller, M. A. and Wainright, J. S. and Savinell, R. F. (2017) Influence of Pretreatment on Kinetics at Carbon Electrodes and Consequences for Flow Battery Performance. MRS Advances, 2 (21-22). pp. 1131-1142. ISSN 2059-8521

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Abstract

Using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), it was shown for four different types of carbon that electrode treatments at negative potentials enhance the kinetics of VIV-VV and inhibit the kinetics of VII-VIII while electrode treatments at positive potentials inhibit the kinetics of VIV-VV and enhance the kinetics of VII-VIII. These observations may explain conflicting reports in the literature. The potentials required for activation and deactivation of electrodes were examined in detail. The results suggest that interchanging the positive and negative electrodes in a vanadium flow battery (VFB) would reduce the overpotential at the negative electrode and so improve the performance. This is supported by flow-cell experiments. Thus, periodic catholyte-anolyte interchange, or equivalent alternatives such as battery overdischarge, show promise of improving the voltage efficiency of VFBs.

Item Type:	Article
Additional Information:	Publisher Copyright: © Copyright 2017 Materials Research Society.
Uncontrolled Keywords:	/dk/atira/pure/subjectarea/asjc/2200/2210
Departments or Groups:
Depositing User:	Admin SSL
Date Deposited:	19 Oct 2022 23:09
Last Modified:	07 Jun 2023 18:45
URI:	http://repository-testing.wit.ie/id/eprint/4405

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