Highly Reversible\nZn Metal Anode Enabled by Interfacial\nWater Pocket

The zinc metallic anode encounters significant challenges\nstemming\nfrom vigorous and prolonged water-induced side reactions along with\nuncontrolled dendritic Zn growth, resulting in a notable decrease\nin the Coulombic efficiency (CE) and longevity of aqueous zinc batteries\n(AZBs). To mitigate the negative impacts of water’s reactivity,\na robust aluminum-centered metal–organic framework (MOF) is\nutilized. This MOF features a water pocket embedded within its subnano\nchannels, serving to safeguard the Zn anode. The water pocket within\nnarrow channels captures water molecules originating from solvated\nZn<sup>2+</sup>, facilitating gradual desolvation, thus eliminating\nwater-induced corrosion and side reactions. Essentially, the modified\nsubnano channels act as ion rectifiers, aiding swift and even Zn<sup>2+</sup> transfer, thereby averting dendrite creation on the Zn metal.\nConsequently, the shielded Zn metal exhibits unparalleled cycling\nstability, surpassing 2000 cycles, and an exceptionally high average\nCE of 99.47%. Moreover, the modified MOF@Zn|KVOH (KV<sub>12</sub>O<sub>30‑<i>y</i></sub>·<i>n</i>H<sub>2</sub>O) cell demonstrates a consistent cycling performance, achieving\n6000 cycles at 5 A g<sup>–1</sup>. This groundbreaking approach\nfor enhancing the reversibility of Zn metal anodes could drive the\npractical adoption of AZBs.