Graphene-based deep eutectic solvent nanofluids with high photothermal conversion and high-grade energy

Jingqiong Gao, Wei Yu, Huaqing Xie and Omid Mahian

Renewable Energy, 2022, vol. 190, issue C, 935-944

Abstract: The photothermal properties of nanofluids have been the focus of direct absorption solar collectors (DASCs). At present, there are few studies on the application of nanofluids in high temperature field. Liquids with low specific heat capacity can reach higher temperatures under the same solar radiation, which broadens the application of nanofluids at high temperatures. In this work, urea/choline chloride (ChCl) deep eutectic solvent (DES) is proposed as a new base fluid. Compared with water, urea/ChCl DES has high boiling point and small specific heat capacity, which exhibits better photothermal performance in DASCs. DES is prepared by heating method and its photothermal conversion efficiency reaches high value of 56.9%, which is 36.4% and 11% higher than that of water and ethylene glycol (EG), respectively. Experimental studies reveal that the photothermal conversion efficiency of 40 ppm graphene DES nanofluid can be as high as 94.3%, and its maximum temperature can reach 115 °C when the solar radiation is raised to 2000 W•m−2. In addition, graphene DES nanofluids demonstrate great stability with no settling within 45 days. This research demonstrates that DES nanofluids have the high energy grade, which expands the scope of its application.

Keywords: Deep eutectic solvent; Nanofluids; Photothermal conversion; Stability; Graphene (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:190:y:2022:i:c:p:935-944

DOI: 10.1016/j.renene.2022.03.145

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