Sorption-based atmospheric water-harvesting (AWH) could help to solve global freshwater scarcity. The search for adsorbents with high water-uptake capacity at low relative humidity, rapid adsorption–desorption kinetics and high thermal conductivity is a critical challenge in AWH. Herein, we report a MAF-4 (aka ZIF-8)-derived nanoporous carbon (NPC_MAF-4-800) with multiple N-doped sites, considerable micropore characteristics and inherent photothermal properties, for efficient water production in a relatively arid climate. NPC_MAF-4-800 exhibited optimal water-sorption performance of 306 mg g⁻¹ at 40% relative humidity (RH). An excellent sunlight-absorption rate was realized (97%) attributed to its high degree of graphitization. A proof-of-concept device was designed and investigated for the practical harvesting of water from the atmosphere using natural sunlight. NPC_MAF-4-800 achieved an unprecedentedly high water production rate of 380 mg g⁻¹ h⁻¹ at 40% RH, and could produce 1.77 L kg⁻¹ freshwater during daylight hours in an outdoor low-humidity climate of ∼25 °C and 40% RH. These findings may shed light on the potential of MOF-derived porous carbons in the AWH field, and inspire the future development of solar-driven water-generation systems.

中文翻译：

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利用 MAF-4 衍生的氮掺杂纳米多孔碳快速收集太阳能驱动的大气水


基于吸附的大气集水（AWH）有助于解决全球淡水短缺问题。寻找在低相对湿度下具有高吸水能力、快速吸附-解吸动力学和高导热率的吸附剂是 AWH 的一个关键挑战。在此，我们报道了一种MAF-4（又名ZIF-8）衍生的纳米多孔碳（NPC _MAF-4 -800），具有多个N掺杂位点、相当大的微孔特征和固有的光热特性，可用于高效产水气候相对干旱。 NPC _MAF-4 -800 在 40% 相对湿度 (RH) 下表现出 306 mg g ⁻¹ 的最佳吸水性能。由于其高度石墨化，实现了优异的阳光吸收率（97%）。设计并研究了一种概念验证设备，用于利用自然阳光从大气中实际收集水。 NPC _MAF-4 -800 在 40% RH 下实现了前所未有的高产水率 380 mg g ⁻¹ h ⁻¹ ，可产生 1.77 L kg ⁻¹ 白天在约 25 °C 和 40% RH 的室外低湿度气候下使用淡水。这些发现可能揭示 MOF 衍生的多孔碳在 AWH 领域的潜力，并激发太阳能驱动的水生成系统的未来发展。