Scientific Results

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: – Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E-36310, Vigo, Spain
– CNR-INO National Institute of Optics, Largo E. Fermi, 6, I-50125, Firenze, Italy
– University of Pisa, Department of Energy, Systems, Territory and Constructions Engineering (D.E.S.T.eC.), Largo L. Lazzarino, I-56122, Pisa, Italy
– INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Firenze, 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

KeyWords: Direct absorption solar collectors
Concentrating solar power
Solar steam generation
Nanofluids
Graphene nanoplatelets
Optical properties
DOI: 10.1016/j.renene.2019.04.075

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English