In situ mapping of activity distribution and oxygen evolution reaction in vanadium flow batteries

Kaijie Ma, Yunong Zhang, Le Liu (), Jingyu Xi, Xinping Qiu, Tian Guan and Yonghong He ()
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Kaijie Ma: Tsinghua University
Yunong Zhang: Tsinghua University
Le Liu: Tsinghua University
Jingyu Xi: Tsinghua University
Xinping Qiu: Tsinghua University
Tian Guan: Tsinghua University
Yonghong He: Tsinghua University

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Understanding spatial distribution difference and reaction kinetics of the electrode is vital for enhancing the electrochemical reaction efficiency. Here, we report a total internal reflection imaging sensor without background current interference to map local current distribution of the electrode in a vanadium redox flow battery during cyclic voltammetry (CV), enabling mapping of the activity and reversibility distribution with the spatial resolution of a single fiber. Three graphite felts with different activity are compared to verify its feasibility. In long-term cyclic voltammetry, the oxygen evolution reaction is proved to enhance activity distribution, and homogeneity of the electrode and its bubble kinetics with periodic fluctuation is consistent with the cyclic voltammetry curve, enabling the onset oxygen evolution/reduction potential determination. Higher activity and irreversibility distribution of the electrode is found in favor of the oxygen evolution reaction. This sensor has potential to detect in situ, among other processes, electrochemical reactions in flow batteries, water splitting, electrocatalysis and electrochemical corrosion.

Date: 2019
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DOI: 10.1038/s41467-019-13147-9

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