Overlimiting current by interactive ionic transport between space charge region and electric double layer near ion-exchange membranes

In electrodialysis, a theoretical understanding of overlimiting current (greater ionic transport beyond the electroneutrality limit) has not been clearly demonstrated, despite two hypothetical explanations: the water splitting reaction and electro-convection. To suggest another possible mechanism for this phenomenon, the Nernst-Planck-Poisson equations were solved via the Painlevé equation of the second kind. Numerical simulations found that …