Solar Absorber Gel: Localized Macro‐Nano Heat Channeling for Efficient Plasmonic Au Nanoflowers Photothermic Vaporization and Triboelectric Generation,Advanced Energy Materials

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Solar Absorber Gel: Localized Macro‐Nano Heat Channeling for Efficient Plasmonic Au Nanoflowers Photothermic Vaporization and Triboelectric Generation
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-07-15 , DOI: 10.1002/aenm.201800711
Minmin Gao ₁ , Connor Kangnuo Peh ₁ , Huy Thong Phan ₂ , Liangliang Zhu ₁ , Ghim Wei Ho _{1,

2,

3}

Affiliation

Plasmonic nanoparticles with outstanding photothermal conversion efficiency are promising for solar vaporization. However, the high cost and the required intense light excitation of noble metals, hinder their practical application. Herein, an inexpensive 3D plasmonic solar absorber gel that embraces all the desirable optical, thermal, and wetting properties for efficient solar vaporization is reported. The broadband absorption and strong near‐field intertip enhancement of the sparsely dispersed gold nanoflowers contribute to efficient light‐to‐heat conversion, while the macro‐nano thermal insulative silica gel retains and channels the plasmonic heat directly to the water pathways contained within the porous gel. The plasmonic‐based solar absorber gel shows a vaporization efficiency of 85% under solar irradiation of 1 sun intensity (1 kW m⁻²). Moreover, the porous gel framework exhibits high mechanical stability and antifouling properties, potentially useful for polluted/turbid water evaporation. Complementary water condensation‐induced triboelectricity can be harvested alongside fresh water condensate, granting simultaneous fresh water production and electricity generation functionalities. The facile sol‐gel synthesis at room temperature makes the solar absorber gel highly adaptable for practical large‐scale photothermal applications.

中文翻译：

太阳能吸收剂凝胶：局部宏观-纳米热通道，用于高效等离子金纳米粒子的光热汽化和摩擦发电

具有出色的光热转换效率的等离子体纳米粒子有望用于太阳能蒸发。但是，贵金属的高成本和所需的强光激发阻碍了它们的实际应用。在本文中，报道了一种便宜的3D等离子体太阳能吸收剂凝胶，该凝胶包含了所有所需的光学，热和湿润性能，可实现有效的太阳能蒸发。稀疏分散的金纳米花的宽带吸收和近场尖端的强烈增强有助于有效的光热转换，而大纳米隔热硅胶将等离子体热直接保留并引导到多孔材料中包含的水路中凝胶。基于等离子的太阳能吸收剂凝胶在1个太阳强度（1 kW m^-2）。此外，多孔凝胶骨架表现出高的机械稳定性和防污性能，潜在地可用于污染/浑浊的水蒸发。可以与淡水凝结水一起收获互补的水凝结摩擦电，同时提供淡水生产和发电功能。室温下易于合成的溶胶凝胶使太阳能吸收剂凝胶高度适合实际的大规模光热应用。

更新日期：2018-07-15

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