TpPa‐1 COFs‐Enhanced Zwitterion Hydrogel for Efficient Harvesting of Atmospheric Water

Zwitterionic hydrogel, serving as carriers for hygroscopic salts, holds significant potential in atmospheric water harvesting. However, their further application is limited by structural collapse in high-concentration salt solution and poor photothermal conversion performance. Herein, the graded pore structure of poly-3-[dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azaniumyl]propane-1-sulfonate (PDMAPS) zwitterionic hydrogel/TpPa-1 covalent organic frameworks (COFs)/LiCl composite (named as PCL composite hydrogel) is proposed, which leads to the accelerated diffusion effect for water molecules. As a result, the vapor adsorption capacity of the optimal composite hydrogel (PCL-42) reaches 2.88 g g