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Journal of Electrochemical Science and Engineering, Vol. 2 No. 4, 2012.

Original scientific paper

https://doi.org/10.5599/jese.2012.0020

Platinized titanium dioxide electrodes for methanol oxidation and photo-oxidation

Svetlozar Ivanov ; Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
Ioanna Mintsouli ; Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
Jenia Georgieva ; Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
Stephan Armyanov ; Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
Eugenia Valova ; Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
Georgios Kokkinidis ; Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
Ioannis Poulios ; Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
Sotiris Sotiropoulos ; Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece

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Abstract

Platinized deposits have been formed on TiO2 particulate films supported on Ti substrates, by means of galvanic replacement of pre-deposited metallic Cu and subsequent immersion of the Cu/TiO2 coatings into a chloroplatinic acid solution. The spontaneous replacement of Cu by Pt results in Pt(Cu)/TiO2/Ti electrodes. Both the platinized and the precursor TiO2/Ti electrodes have been characterized by SEM micro­scopy/EDS spectroscopy, their surface electrochemistry has been assessed by cyclic voltammetry in the dark and their photoelectrochemical properties by photovolta­m­metry under UV illumination. It has been found that, although platinized rutile-rich electrodes exhibit typical Pt surface electrochemistry, the anatase-rich electrodes show only traces of oxide formation and stripping. The latter has been translated to a suppression of methanol oxidation at anatase-rich electrodes. On the contrary, methanol oxidation at platinized rutile-rich electrodes occurs at significant rates and can be further enhanced upon UV illumination, as a result of Pt and TiO2 synergism in the photoelectrochemical oxidation of methanol.

Keywords

Titanium dioxide; platinum; galvanic replacement; electrocatalysis; photoelectrocatalysis

Hrčak ID:

91142

URI

https://hrcak.srce.hr/91142

Publication date:

10.11.2012.

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