Vanadium(III)/Vanadium(II) and Hydrogen Evolution Thermodynamic Behavior at the Negative of the All-Vanadium Redox Flow Batteries

Vanadium(III)/Vanadium(II) and Hydrogen Evolution Thermodynamic Behavior at the Negative of the All-Vanadium Redox Flow Batteries

The major negative reaction in all vanadium redox flow batteries (VRFBs) is oxidation-reduction reaction of V3+/V2+ couple, while the side reaction is hydrogen evolution reaction (HER). This work demonstrates a method to determine the reaction priority of V3+ reduction and HER occurring at the negat...

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Veröffentlicht in:Journal of the Electrochemical Society 2017-01, Vol.164 (12), p.A2403-A2406
Hauptverfasser: Chen, Fuyu, Gu, Shiyan, Ma, Qingbang, Liu, Qingyu, Zhang, Min
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container_issue 12
container_start_page A2403
container_title Journal of the Electrochemical Society
container_volume 164
creator Chen, Fuyu
Gu, Shiyan
Ma, Qingbang
Liu, Qingyu
Zhang, Min
description The major negative reaction in all vanadium redox flow batteries (VRFBs) is oxidation-reduction reaction of V3+/V2+ couple, while the side reaction is hydrogen evolution reaction (HER). This work demonstrates a method to determine the reaction priority of V3+ reduction and HER occurring at the negative graphite electrode by using steady state polarization curve. The result shows that the reaction priority of V3+ reduction and HER has a strong influence on the state of charge(SoC), hydrogen ion activity and density of charging current. Under the constant charging current density, the method can be concluded the priority reaction occurred at the negative electrode under a given SoC and concentration of proton.
doi_str_mv 10.1149/2.0751712jes
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