Reversible Bond Dynamics Enable Crystallinity‐Healed COF Membranes for Selective Ion Transport

H as a model, this healing process enhances the (100) x-ray diffraction peak intensity by 25-fold, resulting in a 375% increase in proton conductivity and enhanced monovalent cation-cation selectivity. This "make-then-heal" strategy leverages dynamic covalent chemistry to produce structurally precise, crystallinity-healed COF membranes.