Metallic Zn has been regarded as ideal anodes in aqueous electrolyte owing to its high theoretical capacity, intrinsic safety, low cost, and nontoxicity. However, the Zn dendrite growth and the side-reactions hindered the practical application of Zn anode. Herein, a thin and uniform three-dimensional (3D) COOH-functionalized covalent organic frameworks (COF) film (denoted as 3D-COOH-COF) is designed and in-situ synthesized as a protective layer to stabilize the Zn anode. The thin 3D-COOH-COF protection film with abundant negative functional groups and homogeneous nanochannels facilitates the fast transport of Zn²⁺, impedes the pass through of SO₄²⁻, and significantly suppresses the corrosion reactions, leading to an excellent electrochemical performance. The novel 3D-COOH-COF protective film enables the Zn||Zn symmetric cells to stably cycle for over 2000 h at 1 mA cm⁻² and an average Coulombic efficiency of Zn plating/stripping as high as 99.5% for 1000 cycles at 1 mA cm⁻².This finding provides a facile and promising route to regulate the deposition behavior of Zn in aqueous electrolyte.

金属锌因其高理论容量、固有安全性、低成本和无毒等优点而被认为是水系电解质中的理想负极。然而，锌枝晶的生长和副反应阻碍了锌负极的实际应用。在此，设计并原位合成了薄而均匀的三维 (3D) COOH 功能化共价有机框架 (COF) 薄膜（表示为 3D-COOH-COF）作为保护层以稳定锌负极。3D-COOH-COF保护膜具有丰富的负官能团和均匀的纳米通道，有利于Zn ²⁺的快速传输，阻碍SO ₄ ^2-的通过，并显着抑制腐蚀反应，从而获得优异的电化学性能。新型 3D-COOH-COF 保护膜使 Zn||Zn 对称电池在 1 mA cm ^-2下稳定循环超过 2000 小时，在 1下 1000 次循环的 Zn 电镀/剥离平均库仑效率高达 99.5% mA cm ^-2。这一发现为调节锌在水性电解质中的沉积行为提供了一种简便且有前景的途径。