Selective Absorbing Surface Based on CrO 3: Evaluation of Substrates Treatment Influence on the Films Optical Properties

Gustavo Furtado Pereira, Aline da Silva Oliveira, Kelly Cristiane Gomes, José Félix Silva Neto, Thiago Araújo Simões, Antônio Farias Leal, Sandro Marden Torres and Marçal Rosas Florentino Lima Filho ()
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Gustavo Furtado Pereira: Postgraduate Programme in Renewable Energies, Federal University of Paraíba, João Pessoa 58051-900, Brazil
Aline da Silva Oliveira: Postgraduate Programme in Renewable Energies, Federal University of Paraíba, João Pessoa 58051-900, Brazil
Kelly Cristiane Gomes: Postgraduate Programme in Renewable Energies, Federal University of Paraíba, João Pessoa 58051-900, Brazil
José Félix Silva Neto: Renewable Energy Engineering Department, Federal University of Paraíba, João Pessoa 58051-900, Brazil
Thiago Araújo Simões: Postgraduate Programme of Materials Science and Engineering, Federal University of Paraíba, João Pessoa 58051-900, Brazil
Antônio Farias Leal: Materials Science Engineering Department, Federal University of Paraíba, João Pessoa 58051-900, Brazil
Sandro Marden Torres: Mechanical Engineering Department, Federal University of Paraíba, João Pessoa 58051-900, Brazil
Marçal Rosas Florentino Lima Filho: Renewable Energy Engineering Department, Federal University of Paraíba, João Pessoa 58051-900, Brazil

Energies, 2022, vol. 16, issue 1, 1-17

Abstract: Solar energy presents the greatest potential by which to produce heat energy with reduced carbon emissions for power generation. To increase its harvesting and conversion, it is necessary to understand fundamental concepts and develop new materials. Although many processes can obtain selective absorbing surfaces (SAS) for application in solar energy exploitation, including electroplating methods, those processes have not sufficiently investigated the substrate’s treatment impact. The present work investigates 304 stainless steel (SS304) substrates treatment influence on the film’s (coatings) optical properties of SAS based on CrO 3 electroplating. For this purpose, three main steps featured in the methodology: substrates treatment, coatings deposition, and physical-chemical characterization. The former was performed by detergent cleaning (DC), acid treatment (AT), and electropolishing (EP). Then, coatings were electroplated towards chromium deposition on the substrates with different deposition times. Finally, films were characterized by Profilometry, UV-Vis-NIR, and IR regions Spectroscopy and Scanning Electron Microscopy (SEM). The results indicated that, in terms of surface treatments on the substrate, the electropolished (EP) substrates presented average roughness values of 35 nm, reflectivity of 5.09%, and clear morphological difference (SEM) when compared to other treatments in this study (DC and AT). A SAS was successfully obtained, and the electropolished substrates (EP) presented coatings with better optical performance than other samples (DC and AT), with absorptivity values around 98% and emissivity of approximately 7%. A relationship between substrate treatment, its roughness, and the impacts on the optical selectivity of SASs was observed. Therefore, electropolishing is presented as a promising treatment for the SASs substrates.

Keywords: selective absorbing surface; solar energy; electropolishing; electroplating; CrO 3 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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