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

Year: 2019

Authors: Vallejo J., Mercatelli L., Martina M.R., Di Rosa D., Dell’Oro A., Lugo L., Sani E.

Autors Affiliation: Univ Vigo, Fac Ciencias, Dept Fis Aplicada, E-36310 Vigo, Spain; CNR, INO Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy; Univ Pisa, Dept Energy Syst Terr & Construct Engn DESTeC, I-56122 Pisa, Italy; Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.

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 (SGnP) 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.

Journal/Review: RENEWABLE ENERGY

Volume: 141      Pages from: 791  to: 801

More Information: This work was partially supported by EU COST Action CA15119: Overcoming Barriers to Nanofluids Market Uptake (NANOUPTAKE) in the framework of the Short Term Scientific Mission program. This work was also partially supported by “Ministerio de Economia y Competitividad” (Spain) and FEDER program through ENE2014-55489-C2-2-R and ENE2017-86425-C2-1-R projects. J. P. V. acknowledges FPI Program of “Ministerio de Economia y Cornpetitividad”. Thanks are due to Mr. M. D´Uva and Mr. M. Pucci (INO-CNR) for technical assistance.
KeyWords: Direct absorption solar collectors
Concentrating solar power
Solar steam generation
Nanofluids
Graphene nanoplatelets
Optical properties
DOI: 10.1016/j.renene.2019.04.075

ImpactFactor: 6.274
Citations: 28
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