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Ion transport across the 2D channels. (A–C) The relative ion permeation rates versus their hydration enthalpies across the PTFE membrane, the pristine MoS2 membrane, and the MoS2-COOH membrane, respectively. The dashed lines are guidelines. Mixture: ~4 mM, Cl−/NO3− (~96 mM:44 mM) anions, pH ~ 4.13.
