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Interfacial Electron Transfer Involving Vanadium and Graphene Quantum Dots for Redox Flow Battery

Published online by Cambridge University Press:  05 February 2018

L. Robarts  and
K.S.V. Santhanam
L. Robarts
Affiliation:
School of Chemistry and Materials Science, Rochester Institute of Technology, Rochester, NY14623, USA
K.S.V. Santhanam*
Affiliation:
School of Chemistry and Materials Science, Rochester Institute of Technology, Rochester, NY14623, USA
*
*Corresponding author:ksssch@rit.edu
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Abstract

Among energy storage devices, the redox flow batteries are important for variety of applications such as for grid storage. In this class of batteries a large number of redox couples have been examined in the past. The vanadium redox couple, although is attractive for this application, suffers from a) poor charge transfer characteristics b) electrode degradation and c) deteriorating performance. We wish to report here that all these deficiencies have been overcome by using a graphene quantum dot electrodes. This electrode has the advantage of large surface area, high electrical and thermal conductivity. The cell voltage of 1.5 V and power density of about 120 mW/cm2 and coulombic efficiency of 90% can be achieved as the redox couples, V(IV)/V(V) and V(III)/V(II) undergo fast electron transfer at the interface of the quantum dots and solution resulting in higher reversibility. The cyclic voltammetric experiments carried out with quantum dots in the solutions during the oxidation of V(IV) show enhanced currents, due to the movements of the dots which is conducive for power gain in the battery operation. The electrochemical degradation is absent with the quantum dot electrode. The charge/discharge cycles have been reproducible.

Keywords

energy storageoxidationchemical reaction
Type
Articles
Information
MRS Advances , Volume 3 , Issue 22: Energy and Sustainability , 2018 , pp. 1221 - 1228
Copyright
Copyright © Materials Research Society 2018 

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