While high ionic conductivity, robust mechanical properties, and alkaline stability are prerequisites for anion exchange membranes (AEMs), enhanced interfacial mass transfer between AEMs and electrodes is equally critical. Poor interfacial contact impedes ion transport, degrading device performance. Here, we fabricate a semi-interpenetrating (SIPN) AEM (SIPN- c Celx/PDDAy) via a hydrogel strategy using crosslinked cellulose and poly(diallyldimethylammonium) (PDDA), featuring swelling anisotropy and high hydration. Lateral cellulose aggregation ...