Superhydrophobic porous polymer‐supported atomic copper for boosting ammonia capture under real‐world conditions

Abstract Metal sites enable efficient and precise ammonia (NH 3 ) capture, but their leaching and mineralization occur upon long‐term exposure to water vapor and corrosive impurities. Here we report a new Cu‐carboxyl center constructed by anchoring atomic copper on carboxyl‐modified, superhydrophobic nanoporous polydivinylbenzene (N‐PDVB‐COOH). The resulting xCu@N‐PDVB‐COOH shows high NH 3 capacities, improved NH 3 /N 2 /H 2 IAST selectivities, superior separation precision, and robust recyclability. Under extreme conditions with water vapor, SO 2 , and NO x , it maintains performance without structural damage, Cu leaching, or mineralization, outperforming literature‐reported sorbents. The mechanism stems from the tunable Cu‐carboxyl center on superhydrophobic N‐PDVB‐COOH, which facilitates specific NH 3 recognition and reversible adsorption while excluding H 2 O and other interferents. This dual‐function design blocks competitors from the Cu‐carboxyl center, allowing efficient NH 3 capture and concurrent resistance to deactivation. Importantly, this principle extends to other atomic metals (e.g., Ni, Co) on N‐PDVB‐COOH, establishing a universal platform for water‐ and corrosion‐resistant sorbents for versatile gas separations.