Effect of flow-field structure on discharging and charging behavior of hydrogen/bromine redox flow batteries

TitleEffect of flow-field structure on discharging and charging behavior of hydrogen/bromine redox flow batteries
Publication TypeJournal Article
Year of Publication2017
AuthorsKyeongmin Oh, Tae June Kang, Sungjin Park, Michael C Tucker, Adam Z Weber, Hyunchul Ju
JournalElectrochimica Acta
Volume230
Pagination160 - 173
Date Published01/2017
ISSN00134686
KeywordsBromide, Convection, Flow mode, Hydrogen bromine redox flow batteries, Numerical simulation
Abstract

<p>Designing and optimizing the flow-field structure for the liquid phase Br2/HBr electrolyte solution of H2/Br2&nbsp;redox flow batteries (RFBs) is important for improving cell performance. In this study, two electrolyte flow modes, i.e. the flow-by and flow-through modes, are simulated by using a three-dimensional H2/Br2&nbsp;RFB model. The model is first applied to real-scale H2/Br2&nbsp;cell geometries and then validated against the experimental polarization curves acquired using the two different flow modes. The model predictions compare well with the experimental data and further highlight the advantages of using the flow-through mode relative to the flow-by mode. Detailed multi-dimensional contours of the electrolyte flow velocity and key species distributions reveal that more uniform diffusion and stronger convective transport are achieved by using the flow-through mode, which alleviates the ohmic loss associated with charge transport in the Br2&nbsp;electrode.</p>

DOI10.1016/j.electacta.2017.01.125
Short TitleElectrochimica Acta
Refereed DesignationRefereed