Enhancement of photothermal conversion performance using nanofluids based on bimetallic Ag-Au alloys in nitrogen-doped graphitic polyhedrons

被引：60
作者：
Zhu, Guihua [1 ,2 ]
Wang, Lingling [1 ,2 ]
Bing, Naici [1 ,2 ]
Xie, Huaqing [1 ,2 ]
Yu, Wei [1 ,2 ]
机构：
[1] Shanghai Polytech Univ, Coll Engn, Sch Environm & Mat Engn, Shanghai 201209, Peoples R China
[2] Shanghai Polytech Univ, Res Ctr Resource Recycling Sci & Engn, Shanghai 201209, Peoples R China
来源：
ENERGY | 2019年 / 183卷
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
Composite nanofluids; Plasmonic bimetallic alloy; Nitrogen-doped graphitic polyhedrons; Photothermal conversion; Solar energy; SOLAR THERMAL-CONVERSION; NANOPLATELETS NANOFLUID; CARBON NANOTUBES; ABSORPTION; NANOPARTICLE; GENERATION; HEAT;
D O I：
10.1016/j.energy.2019.06.170
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The working fluids with higher solar thermal conversion performance within broadband spectrum ranges are of great concern for direct absorption solar collectors (DASCs). Both metal nanoparticles with localized surface plasmon resonance (LSPR) effects and carbon nanomaterials have unique spectral absorption behaviors and have shown better photothermal performance in DASCs. In this paper, we attempted to prepare composite nanofluids including plasmonic bimetallic alloy and carbon nanomaterials to realize enhanced solar absorption and photothermal conversion performance. By taking ZIF-8-derived nitrogen-doped graphitic polyhedrons (ZNGs) as carrier, plasmonic bimetallic Ag-Au alloy nanoparticles were loaded on them by an impregnation-reduction method successfully. Ag-Au/ZNGs ethylene glycol nanofluids showed significant broadband absorption in the visible and near-infrared spectrum range at a lower concentration. Comparing to ethylene glycol, the photothermal conversion effeiency of all ZNGs nanofluids increased remarkablely. Plasmonic bimetallic Ag-Au alloy nanoparticles further improved the photothermal conversion efficiency, which was up to 74.35% for Ag-Au ZNGs nanofluids compared with 72.41%, 70.35% for Au/ZNGs, Ag/ZNGs respectively. This work presents a new way to enhance solar energy absorption and improve solar thermal conversion efficiency of nanofluids for DASCs. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：747 / 755
页数：9
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