Model-based optimization for combined interdigitated and serpentine flow field in redox flow batteries

Abstract

Interdigitated flow field and serpentine flow field are widely adopted in redox flow batteries, but their superiority cannot be determined independently of the operating conditions, electrode properties, and electrolyte properties. Matching the flow field to the operating conditions can effectively improve the efficiency of flow cells. To this end, the present study proposes a model-based optimization method to promote the system energy efficiency of flow cells by combining the interdigitated and serpentine flow channels and considering the heterogeneous distribution of reactants. The fluid dynamic model, electrochemical model, and genetic algorithm are integrated into an optimization framework in the present study to obtain the novel interdigitated-serpentine flow field. Simulative results show that compared to the interdigitated or serpentine flow field, the optimized interdigitated-serpentine flow field yields increments in the system energy efficiency ranging from 2% to 20% under varying operation conditions.