首页|Insights into the hydrogen evolution reaction in vanadium redox flow batteries:A synchrotron radiation based X-ray imaging study

Insights into the hydrogen evolution reaction in vanadium redox flow batteries:A synchrotron radiation based X-ray imaging study

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The parasitic hydrogen evolution reaction(HER)in the negative half-cell of vanadium redox flow batter-ies(VRFBs)causes severe efficiency losses.Thus,a deeper understanding of this process and the accom-panying bubble formation is crucial.This benchmarking study locally analyzes the bubble distribution in thick,porous electrodes for the first time using deep learning-based image segmentation of synchrotron X-ray micro-tomograms.Each large three-dimensional data set was processed precisely in less than one minute while minimizing human errors and pointing out areas of increased HER activity in VRFBs.The study systematically varies the electrode potential and material,concluding that more negative electrode potentials of-200 mV vs.reversible hydrogen electrode(RHE)and lower cause more substantial bubble formation,resulting in bubble fractions of around 15％-20％in carbon felt electrodes.Contrarily,the bub-ble fractions stay only around 2％in an electrode combining carbon felt and carbon paper.The detected areas with high HER activity,such as the border subregion with more than 30％bubble fraction in carbon felt electrodes,the cutting edges,and preferential spots in the electrode bulk,are potential-independent and suggest that larger electrodes with a higher bulk-to-border ratio might reduce HER-related perfor-mance losses.The described combination of electrochemical measurements,local X-ray micro-tomography,AI-based segmentation,and 3D morphometric analysis is a powerful and novel approach for local bubble analysis in three-dimensional porous electrodes,providing an essential toolkit for a broad community working on bubble-generating electrochemical systems.

Vanadium redox flow batterySynchrotron X-ray imagingTomographyHydrogen evolution reactionGas bubblesDeep learning

Kerstin K?ble、Alexey Ershov、Kangjun Duan、Monja Schilling、Alexander Rampf、Angelica Cecilia、Tomá? Faragó、Marcus Zuber、Tilo Baumbach、Roswitha Zeis

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Helmholtz Institute Ulm,Karlsruhe Institute of Technology,89081 Ulm,Germany

Laboratory for Applications of Synchrotron Radiation,Karlsruhe Institute of Technology,76131 Karlsruhe,Germany

Institute for Photon Science and Synchrotron Radiation,Karlsruhe Institute of Technology,76344 Eggenstein-Leopoldshafen,Germany

Department of Electrical,Electronics,and Communication Engineering,Faculty of Engineering,Friedrich-Alexander-Universität Erlangen-Nürnberg(FAU),91058 Erlangen,Germany

Department of Mechanical and Industrial Engineering,University of Toronto,Toronto M5S 3G8,Ontario,Canada

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Sthe China Scholarship Council

202106950013

2024

10.1016/j.jechem.2023.12.010

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.91(4)
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