TY - JOUR KW - Hydrogen bromine redox flow batteries KW - Numerical simulation KW - Flow mode KW - Convection KW - Bromide AU - Kyeongmin Oh AU - Tae June Kang AU - Sungjin Park AU - Michael C Tucker AU - Adam Z Weber AU - Hyunchul Ju AB -

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.

BT - Electrochimica Acta DA - 01/2017 DO - 10.1016/j.electacta.2017.01.125 LA - eng N2 -

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.

PY - 2017 SP - 160 EP - 173 ST - Electrochimica Acta T2 - Electrochimica Acta TI - Effect of flow-field structure on discharging and charging behavior of hydrogen/bromine redox flow batteries VL - 230 SN - 00134686 ER -