A general method for selectively coating photothermal materials on 3D porous substrate surfaces towards cost-effective and highly efficient solar steam generation,Journal of Materials Chemistry A

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A general method for selectively coating photothermal materials on 3D porous substrate surfaces towards cost-effective and highly efficient solar steam generation
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0ta08539a
Bo Shao _{1,

2,

3} , Xuan Wu _{1,

2,

3} , Yida Wang _{1,

2,

3} , Ting Gao _{1,

2,

3} , Zhao-Qing Liu _{4,

5,

6,

7,

8} , Gary Owens _{1,

2,

3} , Haolan Xu _{1,

2,

3}

Affiliation

Photothermal materials (PTMs) based solar steam generation is one of the most promising technologies to mitigate global clean water shortages. Compared to 2D photothermal evaporators, recently developed 3D counterparts can dramatically improve the evaporation rate and energy efficiency of solar evaporation. However, 3D evaporators require much more PTMs which significantly increases the cost of evaporator fabrication. During solar steam generation, since light absorption and solar evaporation only take place on the evaporator surface, in principle only the surfaces of the 3D porous substrates need to be coated with PTMs, but this is currently very challenging. In this work, a general interfacial gelation method is developed to enable the selective coating of various PTMs on the surfaces of 3D porous substrates. With the same PTMs consumption, the evaporation rates of the 3D photothermal evaporators fabricated by this selective surface coating method are increased to 165.7–185.3% compared to that of the evaporators prepared by a traditional coating method. In addition, to achieve the same evaporation rate, the selective surface coating only requires <25% of PTMs. This surface coating method thus paves the way for large-scale application of 3D photothermal evaporators for clean water production by solar evaporation.

中文翻译：

一种在3D多孔基材表面选择性地涂覆光热材料以实现具有成本效益的高效太阳能蒸汽产生的通用方法

基于光热材料（PTM）的太阳能蒸汽发电是缓解全球清洁水短缺的最有前途的技术之一。与2D光热蒸发器相比，最近开发的3D对应物可以显着提高太阳能蒸发的蒸发速率和能源效率。但是，3D蒸发器需要更多的PTM，这大大增加了蒸发器的制造成本。在产生太阳蒸汽期间，由于光吸收和太阳蒸发仅发生在蒸发器表面上，因此原则上仅3D多孔基材的表面需要涂覆PTM，但这目前非常具有挑战性。在这项工作中，开发了一种通用的界面胶凝方法，以能够在3D多孔基板的表面上选择性涂覆各种PTM。在使用相同的PTM的情况下，与传统涂覆方法制备的3D光热蒸发器相比，这种选择性表面涂覆方法制备的3D光热蒸发器的蒸发率提高到165.7-185.3％。此外，为了实现相同的蒸发速率，选择性表面涂层仅需要<25％的PTM。因此，这种表面涂层方法为3D光热蒸发器的大规模应用铺平了道路，该3D光热蒸发器用于通过太阳蒸发生产清洁水。

更新日期：2020-11-17

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