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

Published online by Cambridge University Press:  13 February 2017


D. N. Buckley
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland Department of Chemical Engineering, Case Western Reserve University, Cleveland OH, USA
A. Bourke
Affiliation:
School of Engineering, Waterford Institute of Technology, Ireland
R. P. Lynch
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
N. Quill
Affiliation:
Department of Physics and Energy, Bernal Institute, University of Limerick, Ireland
M. A. Miller
Affiliation:
Department of Chemical Engineering, Case Western Reserve University, Cleveland OH, USA
J. S. Wainright
Affiliation:
Department of Chemical Engineering, Case Western Reserve University, Cleveland OH, USA
R. F. Savinell
Affiliation:
Department of Chemical Engineering, Case Western Reserve University, Cleveland OH, USA
Corresponding
E-mail address:

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.


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Articles
Copyright
Copyright © Materials Research Society 2017 

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