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

Publication Type

Journal Article

Date Published

01/2017

Abstract

Designing and optimizing the flow-field structure for the liquid phase Br2/HBr electrolyte solution of H2/Br2 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 RFB model. The model is first applied to real-scale H2/Br2 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 electrode.

Journal

Electrochimica Acta

Volume

230

Year of Publication

2017

Pagination

160 - 173

ISSN

00134686

Short Title

Electrochimica Acta

Refereed Designation

Refereed