Reformulating the <scp>permselectivity‐conductivity</scp> tradeoff relation in <scp>ion‐exchange</scp> membranes

Polymer membranes used in separation applications exhibit a tradeoff between permeability and selectivity. That is, that are highly permeable tend to have low selectivity vice versa. For ion-exchange such as electrodialysis reverse electrodialysis, this is expressed terms of membrane permselectivity (i.e., ability selectively permeate counter-ions over co-ions) ionic conductivity transport ions the presence an electric field). The use illustrate counter-ion throughput counter-ion/co-ion complicates analysis since depends on properties external solution all mobile within membrane. Furthermore, these parameters restricts which required. In study, permselectivity-conductivity relation for reformulated ion concentrations diffusion coefficients framework enables direct comparison general. generalizability demonstrated cation-exchange vanadium redox flow batteries.