Photoactive TiO2 coatings obtained by Plasma Electrolytic Oxidation in refrigerated electrolytes

Silvia Franz, Daniele Perego, Ottavia Marchese, Andrea Lucotti, Massimiliano Bestetti

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The effect of synthesis conditions on the properties of nanoporous TiO2 coatings obtained by PEO in refrigerated electrolytes have been investigated. Linear sweep voltammetry was carried out on the TiO2 coatings, in dark and under UV-C irradiation, in order to assess the photoelectrochemical behavior of samples. The largest photocurrents (0.18 mA/cm2) were measured on TiO2 coatings obtained by PEO in refrigerated aqueous solutions. UV-vis spectra revealed that lowering the processing temperature from 20 to -3.5 °C induced a blue-shift of the absorption band of the TiO2 coatings from 3.05 to 3.42 eV. The main advantage of PEO in refrigerated aqueous solutions over current approaches, based on anodic oxidation and thermal treatments, is that the synthesis of photoactive TiO2 coatings can be carried out in a relatively easy, quick and reproducible way, without annealing pre- and post-treatments. Furthermore, by controlling the solution temperature in PEO process, the photocurrent of the resulting TiO2 coating reaches quite high values.

Original languageEnglish
Pages (from-to)498-505
Number of pages8
JournalApplied Surface Science
Volume385
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • Anatase
  • Microarc Anodic Oxidation
  • Plasma Electrolytic Oxidation
  • TiO
  • Titanium dioxide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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