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3D Graphene Nanofluids with High Photothermal Conversion and Thermal Transportation Properties

Abstract

Nanofluids as the working fluid enhance solar energy utilization significantly and have led to many remarkable progresses in direct absorption solar collectors (DASCs). In DASCs, nanofluids with better incident light absorption and heat transfer properties are highly desired. In this study, high surface area and self-standing porous three-dimensional (3D) graphene was easily synthesized by preparing with Ni+-exchange/ KOH activation combination method and dispersing in ethylene glycol (EG) as nanofluids. The 3D graphene nanofluids showed greater optical absorption compared to EG in 250-1400 nm wavelength range. 3D graphene / EG nanofluids exhibited an enhanced thermal conductivity compared with some reported results of graphene nanofluids. When the mass fraction of 3D graphene is 0.064%, the thermal conductivity enhancement is 11.67% at 20℃. And the photothermal conversion efficiency of nanofluids reaches a 20% enhancement compared to that of EG. The enhanced photothermal properties of the nanofluids are attributed to the special architectures of 3D graphene, which can prevent the aggregation of nanosheets and provide more thermal transferred tunnel as well as longer light scattering distance. This work reveals that 3D graphene shows the great application potential in solar thermal systems. Keyword: nanofluids; three-dimensional graphene; thermal conductivity; photo- thermal conversion

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Publication details

The article was received on 27 Sep 2019, accepted on 28 Nov 2019 and first published on 28 Nov 2019


Article type: Paper
DOI: 10.1039/C9SE00866G
Sustainable Energy Fuels, 2019, Accepted Manuscript

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    3D Graphene Nanofluids with High Photothermal Conversion and Thermal Transportation Properties

    N. Bing, J. Yang, Y. Zhang, W. Yu, L. Wang and H. Xie, Sustainable Energy Fuels, 2019, Accepted Manuscript , DOI: 10.1039/C9SE00866G

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