Comparative study of different functionalized graphene-nanoplatelet aqueous nanofluids for solar energy applications

Javier P. Vallejo, Luca Mercatelli, Maria Raffaella Martina, Daniele Di Rosa, Dell’Oro, Aldo, Luis Lugo and Elisa Sani

Renewable Energy, 2019, vol. 141, issue C, 791-801

Abstract: The optical properties of nanofluids are peculiar and interesting for a variety of applications. Among them, the high light extinction coefficient of nanofluids can be useful in linear parabolic concentrating solar systems, while their properties under high light irradiation intensities can be exploited for direct solar steam generation. The optical characterization of colloids, including the study of non-linear optical properties, is thus a needed step to design the use of such novel materials for solar energy exploitation. In this work, we analysed two different types of nanofluids, consisting of polycarboxylate chemically modified graphene nanoplatelets (P-GnP) and sulfonic acid-functionalized graphene nanoplatelets (S-GnP) dispersed in water, at three concentrations from 0.005 wt% to 0.05 wt%. Moderately stable nanofluids were achieved with favourable light extinction properties, as well as a non-linear optical behaviour under high input solar intensities.

Keywords: Direct absorption solar collectors; Concentrating solar power; Solar steam generation; Nanofluids; Graphene nanoplatelets; Optical properties (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:141:y:2019:i:c:p:791-801

DOI: 10.1016/j.renene.2019.04.075

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