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Batteries 2018, 4(4), 63; https://doi.org/10.3390/batteries4040063

Towards Production of a Highly Catalytic and Stable Graphene-Wrapped Graphite Felt Electrode for Vanadium Redox Flow Batteries

1
IREC, Catalonia Institute for Energy Research, Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Spain
2
Department of Physical Chemistry, Electrochemistry Research Laboratory, University of Tabriz, Tabriz 5166616471, Iran
3
Engineering Faculty, Department of Materials Science and Nanotechnology, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey
4
Facultat de Física, Universitat de Barcelona, C. Martí i Franqués, 1, 08028 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Received: 13 October 2018 / Revised: 2 November 2018 / Accepted: 5 November 2018 / Published: 3 December 2018
(This article belongs to the Special Issue Vanadium Redox Flow Battery and Its Applications)
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Abstract

Despite the appealing features of vanadium redox flow batteries as a promising energy storage solution, the polarization losses, among other factors, prevent widespread applications. The dominant contribution to these polarization losses is the sluggish (even irreversible) electron-transfer towards reactions, leading to large over-potentials (poor rate capability). In particular, the positive half-cell reaction suffers from a complex mechanism since electron- and oxygen-transfer processes are key steps towards efficient kinetics. Thus, the positive reaction calls for electrodes with a large number of active sites, faster electron transfer, and excellent electrical properties. To face this issue, a graphene-wrapped graphite felt (GO-GF) electrode was synthesized by an electrospray process as a cost-effective and straightforward way, leading to a firm control of the GO-deposited layer-by-layer. The voltage value was optimized to produce a homogeneous deposition over a GF electrode after achieving a stable Taylor cone-jet. The GO-GF electrode was investigated by cyclic voltammetry and electrochemical impedance spectroscopy in order to elucidate the electrocatalytic properties. Both analyses reflect this excellent improvement by reducing the over-potentials, improving reversibility, and enhancing collected current density. These findings confirm that the GO-GF is a promising electrode for high-performance VRFB, overcoming the performance-limiting issues in a positive half-reaction. View Full-Text
Keywords: graphene oxide; electrocatalysis; reversibility; electrode materials; electrospray; deposition; hybrid materials; vanadium redox flow batteries graphene oxide; electrocatalysis; reversibility; electrode materials; electrospray; deposition; hybrid materials; vanadium redox flow batteries
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mousavihashemi, S.; Murcia-López, S.; Hosseini, M.G.; Morante, J.R.; Flox, C. Towards Production of a Highly Catalytic and Stable Graphene-Wrapped Graphite Felt Electrode for Vanadium Redox Flow Batteries. Batteries 2018, 4, 63.

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