Atmospheric water harvesting (AWH) with metal–organic frameworks (MOFs) represents an attractive way to alleviate water shortage stress in arid regions. However, scaling up such a concept has been partially limited by the insufficient development of the highly efficient heating and suitable processing of MOF sorbents for making them more applicable to AWH devices. To overcome these limitations, a commercial carbon fiber (CF) bundle is embedded into an Al-fumarate MOF monolith assisted by a cross-linked sodium alginate (SA) network, resulting in a cylindrical CF/Al-fumarate/SA (CAS) monolith with a coaxial structure. On applying electrical power, the embedded CFs could rapidly generate enormous localized electrical heating (LEH) within a CAS matrix with exceptionally high electrothermal conversion efficiency, thereby triggering the adsorbed water in CASs to be highly efficiently released in an energy-efficient way. In particular, such CAS monoliths can be easily connected to each other in either series or parallel, forming versatile CAS assemblies with well-controlled LEH capacity. Using a serial CAS assembly as atmospheric water sorbents, a newly atmospheric water harvester has been further developed based on an LEH-driven water desorption method. The resulting prototype enables to continuously work for 7.2 water harvesting cycles per day and deliver 1.7 and 1.2 L_H2O kg_Al-Fum/SA^–1 daily water productivity under controlled indoor and outdoor conditions, corresponding to 4.4 and 6.2 kW·h L_H2O^–1 energy consumption, respectively. Please note that this is the first exploration in the use of flexibly assemblable MOF monoliths and the LEH-driven water desorption method for water production with AWH, demonstrating a promising way to achieve energy-efficient, scalable, low-cost, and industrially favorable AWH in arid areas.

中文翻译：

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用于节能大气集水的可组装碳纤维/金属-有机框架单体

具有金属有机框架（MOF）的大气集水（AWH）是缓解干旱地区缺水压力的一种有吸引力的方法。然而，扩大这种概念的规模受到部分限制，因为 MOF 吸附剂的高效加热和适当加工的开发不足，无法使其更适用于 AWH 装置。为了克服这些限制，在交联海藻酸钠 (SA) 网络的辅助下，将商业碳纤维 (CF) 束嵌入富马酸铝 MOF 整体材料中，形成圆柱形 CF/富马酸铝/SA (CAS) 整体材料采用同轴结构。在施加电力时，嵌入式 CF 可以在 CAS 矩阵内快速产生巨大的局部电加热 (LEH)，具有极高的电热转换效率，从而触发 CAS 中的吸附水以节能的方式高效释放。特别是，这种 CAS 单体可以很容易地以串联或并联方式相互连接，形成具有良好控制的 LEH 容量的多功能 CAS 组件。使用串行 CAS 组件作为大气水吸附剂，基于 LEH 驱动的水解吸方法进一步开发了一种新的大气水收集器。由此产生的原型能够每天连续工作 7.2 个集水周期，并提供 1.7 和 1.2 L 使用串行 CAS 组件作为大气水吸附剂，基于 LEH 驱动的水解吸方法进一步开发了一种新的大气水收集器。由此产生的原型能够每天连续工作 7.2 个集水周期，并提供 1.7 和 1.2 L 使用串行 CAS 组件作为大气水吸附剂，基于 LEH 驱动的水解吸方法进一步开发了一种新的大气水收集器。由此产生的原型能够每天连续工作 7.2 个集水周期，并提供 1.7 和 1.2 L_{在受控的室内和室外条件下， H2O} kg _Al-Fum/SA ^–1日产水量分别对应于 4.4 和 6.2 kW·h L _H2O ^–1的能耗。请注意，这是首次探索使用可灵活组装的 MOF 整体材料和 LEH 驱动的水解吸方法进行 AWH 制水，展示了一种实现节能、可扩展、低成本和工业上有利的 AWH 的有前景的方法在干旱地区。