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-NH2, that enable efficient moisture capture through hydrogen-bond-engineered adsorption. Strategic -NH2 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.