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The effect of the addition of colloidal iridium oxide into sol-gel obtained titanium and ruthenium oxide coatings on titanium on their electrochemical properties

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2010
Authors
Panić, Vladimir
Dekanski, Aleksandar
Mitrić, Miodrag
Milonjić, Slobodan K.
Mišković-Stanković, Vesna
Nikolic, Branislav Z.
Article (Published version)
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Abstract
Electrochemical properties of sol-gel processed Ti(0.6)Ir(0.4)O(2) and Ti(0.6)Ru(0.3)Ir(0.1)O(2) coatings on titanium substrate were investigated using cyclic voltammetry, polarization measurements and electrochemical impedance spectroscopy and compared to the properties of Ti(0.6)Ru(0.4)O(2) coating. The role of iridium oxide in the improvement of the electrocatalytic, capacitive and stability properties of titanium anodes activated by a RuO(2)-TiO(2) coating is discussed. The oxide sols were prepared by forced hydrolysis of the metal chlorides. The characterization by dynamic light scattering and X-ray diffraction showed that polydisperse oxide sols were obtained with the particles tending to form agglomerates. The presence of IrO(2) causes a suppression of the X-ray diffraction peaks of TiO(2) and RuO(2) in the sol-gel prepared Ti(0.6)Ir(0.4)O(2) and Ti(0.6)Ru(0.3)Ir(0.1)O(2) coatings. The IrO(2)-containing coatings had an enhanced charge storage ability and activity for the oxygen ...evolution reaction (OER) in comparison to Ti(0.6)Ru(0.4)O(2) coating. The voltammogram of the Ti(0.6)Ir(0.4)O(2)/Ti electrode showed well-resolved peaks related to Ir redox transitions, which are responsible for the enhanced charge storage ability of IrO(2)-containing coatings. Redox transitions of Ir were also registered in the high-frequency domain of the ac impedance spectra of the coatings as a semicircle with characteristics insensitive to the electrolyte composition and to the electrode potential prior to OER. However, the semicircle characteristics were different for the two IrO(2)-containing coatings, as well as at potentials outside the OER in comparison to those at which the OER occurs.

Source:
Physical Chemistry Chemical Physics, 2010, 12, 27, 7521-7528
Publisher:
  • Royal Soc Chemistry, Cambridge
Projects:
  • Kompozitni materijali na bazi ugljenika, metala i oksida metala u elektrokatalizi i procesima skladištenja energije (RS-142048)
  • Elektrohemijske karakteristike oksidnih i polimernih prevlaka na modifikovanim površinama metala (RS-142061)

DOI: 10.1039/b921582d

ISSN: 1463-9076

PubMed: 20544088

WoS: 000279514500024

Scopus: 2-s2.0-77954339067
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/638
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