Deposition of multifunctional TiO2 and ZnO top-protective coatings for CSP application

Houda Ennaceri, Darja Erfurt, Lan Wang, Tristan Köhler, Abdelhafed Taleb, Asmae Khaldoun, Abdallah El Kenz, Abdelilah Benyoussef, Ahmed Ennaoui

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this work, high quality, transparent multifunctional and smart anatase TiO2 and wurtzite ZnO top protective coatings used for CSP silver-based first-surface thick glass mirrors are studied. The TiO2 and ZnO top-coatings are deposited using chemical spray pyrolysis technique which conserves a very good specular reflectance of the mirrors (94% reflectance in the Near Infrared range). The photocatalytic activity of the prepared top-coatings is evaluated using the methylene blue dye (MB) as a model molecule, and the highest activity is observed for ZnO top-coating, with a degradation efficiency of 42%. Moreover, the effect of post-annealing treatment on the photocatalytic degradation of the top-coatings is pointed out, and is explained in terms of crystallinity and surface morphology. The increase of the photocatalytic activity can be achieved by increasing surface roughness, which is a conflicting requirement with optical transparency needed for concentrated solar power (CSP) top-coating application. Furthermore, it is pointed out that TiO2 and ZnO top protective thin films exhibit a photo-induced switching of their wetting properties only after 30 min of UV exposure, and their usability as multifunctional top-protective layers for CSP application is discussed.

Original languageEnglish
Pages (from-to)103-113
Number of pages11
JournalSurface and Coatings Technology
Volume298
DOIs
Publication statusPublished - 25 Jul 2016
Externally publishedYes

Fingerprint

protective coatings
Protective coatings
Solar energy
coatings
Coatings
mirrors
degradation
reflectance
Degradation
Spray pyrolysis
Methylene Blue
methylene blue
Silver
anatase
wurtzite
Titanium dioxide
Transparency
wetting
Surface morphology
pyrolysis

Keywords

  • Concentrated solar power
  • ILGAR
  • Multifunctional coating
  • Photocaytalysis
  • Smart coating
  • Specular reflectance
  • Thin film
  • TiO
  • ZnO

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Deposition of multifunctional TiO2 and ZnO top-protective coatings for CSP application. / Ennaceri, Houda; Erfurt, Darja; Wang, Lan; Köhler, Tristan; Taleb, Abdelhafed; Khaldoun, Asmae; El Kenz, Abdallah; Benyoussef, Abdelilah; Ennaoui, Ahmed.

In: Surface and Coatings Technology, Vol. 298, 25.07.2016, p. 103-113.

Research output: Contribution to journalArticle

Ennaceri, H, Erfurt, D, Wang, L, Köhler, T, Taleb, A, Khaldoun, A, El Kenz, A, Benyoussef, A & Ennaoui, A 2016, 'Deposition of multifunctional TiO2 and ZnO top-protective coatings for CSP application', Surface and Coatings Technology, vol. 298, pp. 103-113. https://doi.org/10.1016/j.surfcoat.2016.04.048
Ennaceri, Houda ; Erfurt, Darja ; Wang, Lan ; Köhler, Tristan ; Taleb, Abdelhafed ; Khaldoun, Asmae ; El Kenz, Abdallah ; Benyoussef, Abdelilah ; Ennaoui, Ahmed. / Deposition of multifunctional TiO2 and ZnO top-protective coatings for CSP application. In: Surface and Coatings Technology. 2016 ; Vol. 298. pp. 103-113.
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