Confined Shape-Morphing and Dual Hydration Modes for Efficient Solar Steam Generation
Confined Shape-Morphing and Dual Hydration Modes for Efficient Solar Steam Generation
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用于高效太阳能蒸汽产生的受限形状变形和双重水合模式
DOI：
10.1021/acsenergylett.2c01700
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发表时间：
2022-09
影响因子：
22
通讯作者：
Jinxing Chen
中科院分区：
文献类型：
--
作者：
Yinghua Qiu;Zirui Zhou;Congyang Zhang;Feng Jiang;Qiao Zhang;Jinxing Chen
水凝胶具有可调的水蒸发焓，是界面太阳能蒸汽蒸发的理想基质。然而，传统的基于水凝胶的蒸发器遭受严重的形状变形和由渗透水合主导的缓慢的水输送。受植物细胞壁空间受限效应的启发，我们提出构建一种3D多孔支撑的水凝胶蒸发器，该蒸发器可以通过将散装水凝胶网格化为许多受限的微空间来对抗其形状变形，从而形成互连的多孔结构。利用其独特的多孔结构，实现了毛细管-渗透双重供水模式，克服了传统水凝胶渗透水化缓慢的缺点。通过对水凝胶蒸发器的组成和结构进行优化，在1个太阳光照下，水凝胶蒸发器的蒸发量为3.0 kg·m-2·h-1，能量效率为90%，在8个太阳光照下，水凝胶蒸发器的供水量也足够。这种结构设计为水凝胶蒸发器在水净化中的可行应用铺平了道路。
Hydrogels are ideal substrates for interfacial solar steam evaporation because of their tunable water evaporation enthalpy. However, conventional hydrogel-based evaporators suffer from severe shape-morphing and slow water transportation dominated by osmotic hydration. Inspired by the space-confined effect in plant cell walls, we propose to construct a 3D skeleton-supported hydrogel evaporator, which can develop against its shape deformation by meshing the bulk hydrogel into many confined microspaces, resulting in an interconnected porous structure. Benefiting from the unique porous architecture, the dual capillary–osmosis water supply modes are achieved to overcome the slow osmotic hydration in conventional hydrogels. With componential and structural optimization, the hydrogel evaporator presents an evaporation rate of 3.0 kg·m–2·h–1under 1-sun irradiation with an energy efficiency of 90%, which can even be maintained under 8-sun illumination due to the sufficient water supply. This structural design paves the way for feasible hydrogel evaporators’ applications in water purification.
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