Sprayable reduced graphene oxide based high-temperature solar absorber coatings for concentrated solar power applications

Nagarajan, S and Karthik, G and Jose, JK and Barshilia, HC (2021) Sprayable reduced graphene oxide based high-temperature solar absorber coatings for concentrated solar power applications. International Journal of Energy Research, 45 (15). pp. 21487-21496. ISSN 0363-907X

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Reduced graphene oxide (RGO) based composite non‐selective solar absorber coatings (RGO/silicate) were developed using a simple spray technique. RGO powders were prepared using the modified Hummers' method. RGO‐silicate suspensions were obtained by adding an appropriate quantity of RGO in a sodium silicate solution. Transmission electron microscopy studies showed the corrugated morphology of reduced graphene oxide powders. The presence of RGO in the composite absorber coatings was confirmed by X‐ray photoelectron spectroscopy data. In order to study the thermal stability, the coatings were deposited on stainless steel (SS) and Inconel substrates. The composite nonselective coating exhibited an absorptance (α) of 0.96 and emittance (ε) of 0.88 at 82°C on SS and Inconel substrates. The coatings sprayed on SS substrates showed good thermal stability for 428 hours at 500°C in air. The coatings sprayed on Inconel substrates were thermally stable in air at 600°C for 96 hours. The performance evaluation tests revealed that these coatings can be used for concentrated solar power applications. Reduced graphene oxide based absorber coating was developed for solar thermal applications. A simple, and cost effective spray process was used for the deposition. High absorptance of 0.96, and an emittance of 0.88 was obtained for the RGO based absorber coating. The coatings exhibited very high thermal stability in air at 500°C for 428 hours.

Item Type: Article
Uncontrolled Keywords: Graphene oxide, Solar power applications
Subjects: RENEWABLE ENERGY > Solar Energy
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mrs. Usha Kumari
Date Deposited: 13 May 2022 11:11
Last Modified: 13 May 2022 11:11
URI: http://nal-ir.nal.res.in/id/eprint/13504

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