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Effects of substrate temperatures on the thermal stability of AlxOy/Pt/AlxOy multilayered selective solar absorber coatings

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  • Nuru, Z.Y.
  • Arendse, C.J.
  • Mongwaketsi, N.
  • Gohshal, S.K.
  • Nkosi, M.
  • Maaza, M.

Abstract

We report the effects of substrate temperatures on the thermal stability of AlxOy/Pt/AlxOy multilayered selective solar absorber coating (MSSAC). The samples were deposited at different substrate temperatures (from room temperature up to 250 °C), and then annealed at various temperatures (300–600 °C) in air for 2 h. Characterizations are made via X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), Atomic Force Microscopy (AFM), Raman Spectroscopy, UV–Vis and emissometeric measurements. These coatings were found to be thermally stable up to 500 °C with good spectral selectivity of 0.930/0.11. Furthermore, the observed decrease in the spectral selectivity 0.883/0.13 at 600 °C is attributed to the diffusion of Cu and the formation of CuO phase. Such phase formation was confirmed using XRD and Raman spectral analysis. The insensitiveness of the thermal stability of such coatings on the substrate temperature is demonstrated.

Suggested Citation

  • Nuru, Z.Y. & Arendse, C.J. & Mongwaketsi, N. & Gohshal, S.K. & Nkosi, M. & Maaza, M., 2015. "Effects of substrate temperatures on the thermal stability of AlxOy/Pt/AlxOy multilayered selective solar absorber coatings," Renewable Energy, Elsevier, vol. 75(C), pages 590-597.
    • Handle: RePEc:eee:renene:v:75:y:2015:i:c:p:590-597
    DOI: 10.1016/j.renene.2014.10.050
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    References listed on IDEAS

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    1. Wazwaz, A & Salmi, J & Hallak, H & Bes, R, 2002. "Solar thermal performance of a nickel-pigmented aluminium oxide selective absorber," Renewable Energy, Elsevier, vol. 27(2), pages 277-292.
    2. Sella, C. & Mâaza, M. & Pardo, B. & Dunsteter, F. & Martin, J.C. & Sainte Catherine, M.C., 1997. "Microstructure and growth mechanism of Pt Al2O3 co-sputtered nanocermet films studied by SAXS, TEM and AFM," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 241(1), pages 192-198.
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    1. Fuqiang, Wang & Qingzhi, Lai & Huaizhi, Han & Jianyu, Tan, 2016. "Parabolic trough receiver with corrugated tube for improving heat transfer and thermal deformation characteristics," Applied Energy, Elsevier, vol. 164(C), pages 411-424.
    2. Hu, Mingke & Zhao, Bin & Ao, Xianze & Feng, Junsheng & Cao, Jingyu & Su, Yuehong & Pei, Gang, 2019. "Experimental study on a hybrid photo-thermal and radiative cooling collector using black acrylic paint as the panel coating," Renewable Energy, Elsevier, vol. 139(C), pages 1217-1226.
    3. Boubault, Antoine & Ho, Clifford K. & Hall, Aaron & Lambert, Timothy N. & Ambrosini, Andrea, 2016. "Levelized cost of energy (LCOE) metric to characterize solar absorber coatings for the CSP industry," Renewable Energy, Elsevier, vol. 85(C), pages 472-483.
    4. Dan, Atasi & Barshilia, Harish C. & Chattopadhyay, Kamanio & Basu, Bikramjit, 2017. "Solar energy absorption mediated by surface plasma polaritons in spectrally selective dielectric-metal-dielectric coatings: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 79(C), pages 1050-1077.

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