Describing ion transport and water splitting in an electrodialysis stack with bipolar membranes by a 2-D model: Experimental validation

Electrodialysis with bipolar membranes (EDBM) has drawn attention motivated by their application in generating reagents from salts. Due to the water splitting (WS) occurring at junction of (BPMs), where anion and cation layers are strict contact, H+ OH- released BPM producing acid alkali on respective compartment. Considering this application, interest work is provide further understanding mechanisms WS transport species EDBM. This develops utilizes, for first time, an experimentally validated two-dimensional (2-D) computational model, which Navier-Stokes Nernst-Planck equations coupled description given Second Wien effect. In addition, a 1-D geometry also proposed perform comparison between electroneutrality Poisson charge conservation. The model computationally solved using COMSOL Multiphysics. According simulations, valid 2-D geometries. Moreover, semipermeable characteristics assessed means evidencing polarization effect resulting double-electric layer. predicts significant proton leakage, facilitates study within BPMs. • Reagent generation Water ion transfer mechanisms. & models CFD.