Tailoring Hydrogen Bonding in Organic Frameworks for Rapid Atmospheric Water Harvesting with Low-Temperature Regeneration

Atmospheric water harvesting (AWH) offers a promising route to address water scarcity by decentralizing freshwater production. Developing materials capable of performing rapid sorption–desorption cycles with reduced energy consumption is crucial for achieving high water productivity. We report amino-functionalized hydrogen-bonded organic frameworks (HOFs), HOF-101-NH 2, that enable efficient moisture capture through hydrogen-bond-engineered adsorption. Strategic -NH 2 integration creates abundant water nucleation sites and promotes cooperative hydrogen-bond networks, achieving a water uptake of ∼0.46 g g –1 at 60% RH. Captured water can be released at ∼50 °C within 3 min, enabling low-energy regeneration. This fast sorption–desorption kinetics allows more than 30 cycles per day with a water yield of ∼15 L kg –1 day –1 . Beyond demonstrating HOFs as effective AWH sorbents, this hydrogen-bond engineering strategy opens opportunities for rational design of next-generation water harvesting materials operating under diverse climatic conditions.