Journal of Solid State Electrochemistry

, Volume 17, Issue 8, pp 2349–2359

Pulsed current electrodeposition of Zn–Ag2S/TiO2 nanocomposite films as potential photoelectrodes

  • A. Gomes
  • A. Videira
  • O. C. Monteiro
  • C. D. Nunes
  • M. L. Carvalho
  • A. B. Lopes
Original Paper

DOI: 10.1007/s10008-013-2099-y

Cite this article as:
Gomes, A., Videira, A., Monteiro, O.C. et al. J Solid State Electrochem (2013) 17: 2349. doi:10.1007/s10008-013-2099-y

Abstract

Nanocomposite Zn–Ag2S/TiO2 and Zn–TiO2 films were prepared by pulsed current electrolysis from acidic zinc sulphate solutions on a titanium substrate. The influence of the nanoparticles' nature on the structural and morphological characteristics of the metallic electrodeposit was also investigated. The electrodeposits were characterized by X-ray diffraction and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. Using transmission electron microscopy, it was possible to conclude that the chemical treatment applied to the commercial TiO2 particles promotes the formation of Ag2S/TiO2 composite nanoparticles, with Ti, Ag, S and O in its composition. This was also was confirmed by X-ray fluorescence spectrometry. These particles absorb visible light radiation which makes them promising materials for photoelectrocatalytic processes. Moreover, the modification in nanoparticle composition plays a remarkable influence on the coating morphology and Zn crystallite size. When TiO2 is added, a change of Zn texture was observed along with a decrease in crystallite size. In contrast, the metal matrix nanocomposites prepared with Ag2S/TiO2 exhibit a spongy Zn morphology with a lower average Zn crystallite size. The nanocomposite films were tested in the photoelectrodegradation of ibuprofen and the best results were obtained for Zn–Ag2S/ TiO2 photoelectrodes.

Keywords

Ag2S/TiO2 nanocomposite particles Metal matrix composite Pulsed current electrodeposition Preferred orientation 

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • A. Gomes
    • 1
  • A. Videira
    • 1
  • O. C. Monteiro
    • 2
  • C. D. Nunes
    • 2
  • M. L. Carvalho
    • 3
  • A. B. Lopes
    • 4
  1. 1.CCMMDepartamento de Química e Bioquímica da Faculdade de Ciências da Universidade de LisboaLisbonPortugal
  2. 2.CQB, Departamento de Química e BioquímicaFaculdade de Ciências da Universidade de LisboaLisbonPortugal
  3. 3.Centro Física Atómica, Faculdade de CiênciasUniversidade de LisboaLisbonPortugal
  4. 4.CICECO—Departamento de Engenharia de Materiais e CerâmicaUniversidade de AveiroAveiroPortugal

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