Abstract

Aqueous solutions near interfaces exhibit altered properties, impacting ion selectivity, reaction pathways, and nucleation. This study investigates unsaturated MgCl2 and Mg(NO3)2 solutions at reduced graphene oxide interface using X-ray diffraction. The results demonstrate limited crystallization, with distinct interfacial crystal behaviors observed for Mg2+ in comparison to Ca2+. Molecular analysis reveals the mechanism that the stable hydration layer of Mg2+ blocks electron migration from graphene. These findings provide insights for preparing carbon-based nanomaterials for ion separation in brine.

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