Matter ( IF 17.3 ) Pub Date : 2023-08-11 , DOI: 10.1016/j.matt.2023.07.015
Zhihua Yu , Shuhui Li , Jing Su , Jichao Zhang , Diandian Zhang , Zhijuan Zhou , Ziqi Qin , Xiaojie Liu , Yuekun Lai , Shaohai Fu
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Atmospheric water harvesting (AWH) offers an appealing way to mitigate the shortage of clean water. Despite the significant advances of AWH, unexpected sorbent leakage and inferior waste heat management are two long-standing bottlenecks for its practical application. Herein, a core-shell structural cellulose nanofiber aerogel (Core-Shell@CNF) is proposed by loading lithium chloride (LiCl) in the hydrophilic core and confining it in the hydrophobic shell. The distinct wettability difference between the core (hydrophilic) and the shell (hydrophobic) allows the programmable free transport of the water molecules but prevents the leakage of the LiCl solution, achieving continuable and recyclable water sorption/desorption. Moreover, the Core-Shell@CNF exhibits fast sorption-desorption kinetics enabled by the vertically aligned pores of the CNF matrix as water molecule transfer channels, about 1.16 g g−1 at 25°C and 90% relative humidity within 2 h. This elaborate core-shell structural design provides a new pathway for efficient solar thermoelectricity-freshwater cogeneration.
中文翻译:
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具有可编程水释放能力的仿生核壳结构气凝胶,可实现高效太阳能热电-淡水热电联产
大气水收集(AWH)为缓解清洁水短缺问题提供了一种颇具吸引力的方法。尽管 AWH 取得了重大进展,但意外的吸附剂泄漏和较差的废热管理是其实际应用的两个长期瓶颈。在此,提出了一种核壳结构纤维素纳米纤维气凝胶(Core-Shell@CNF),通过在亲水核中负载氯化锂(LiCl)并将其限制在疏水壳中。核(亲水性)和壳(疏水性)之间明显的润湿性差异允许水分子的可编程自由传输,但防止LiCl溶液的泄漏,实现连续且可回收的水吸附/解吸。而且,-1在 25°C 和 90% 相对湿度下 2 小时内。这种精心设计的核壳结构设计为高效太阳能热电-淡水热电联产提供了新途径。