Abstract
The ion transport in nanoscale pores/channels are totally different to that in the macroscopic level. Here, a combined method based on the Poisson-Nernst-Planck (PNP) and Navier–Stokes (NS) equations is applied to study the ion transport in graphene oxide membranes (GOMs) with different interlayer spacing distributions by controlling the offset angle of the middle nanosheet of the model. The layered membrane with suitable interlayer spacing distribution has strong electrical double layer (EDL) overlapping and relatively weak spatial confinement, which improves the ion selectivity and water permeation. This phenomenon can be further understood by analyzing microscopic properties including the local density and flux profiles with considering the effects of surface charge and bulk concentration. This work could provide macroscopic insights into the ionic flow in laminar GOMs at a different angle and possible improvement of the GOMs performances.
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