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http://dx.doi.org/10.5695/JKISE.2021.54.4.164

Suppressing Effect of Hydrogen Evolution by Oxygen Functional Groups on CNT/ Graphite Felt Electrode for Vanadium Redox Flow Battery  

Kim, Minseong (Department of Marine design Convergence Engineering, Pukyong National University)
Ko, Minseong (Department of Marine design Convergence Engineering, Pukyong National University)
Publication Information
Journal of the Korean institute of surface engineering / v.54, no.4, 2021 , pp. 164-170 More about this Journal
Abstract
Vanadium redox flow batteries (VRFB) have emerged as large-scale energy storage systems (ESS) due to their advantages such as low cross-contamination, long life, and flexible design. However, Hydrogen evolution reaction (HER) in the negative half-cell causes a harmful influence on the performance of the VRFB by consuming current. Moreover, HER hinders V2+/V3+ redox reaction between electrode and electrolyte by forming a bubble. To address the HER problem, carbon nanotube/graphite felt electrode (CNT/GF) with oxygen functional groups was synthesized through the hydrothermal method in the H2SO4 + HNO3 (3:1) mixed acid solution. These oxygen functional groups on the CNT/GF succeed in suppressing the HER and improving charge transfer for V2+/V3+ redox reaction. As a result, the oxygen functional group applied electrode exhibited a low overpotential of 0.395 V for V2+/V3+ redox reaction. Hence, this work could offer a new strategy to design and synthesize effective electrodes for HER suppression and improving the energy density of VRFB.
Keywords
Vanadium redox flow battery; Hydrogen evolution reaction; Carbon nanotube; Oxygen functional group;
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