%0 Journal Article
%T Platinized titanium dioxide electrodes for methanol oxidation and photo-oxidation
%A SVETLOZAR IVANOV
%A IOANNA MINTSOULI
%A JENIA GEORGIEVA
%A STEPHAN ARMYANOV
%J Journal of Electrochemical Science and Engineering
%D 2012
%I 
%X 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 micro-scopy/EDS spectroscopy, their surface electrochemistry has been assessed by cyclic voltammetry in the dark and their photoelectrochemical properties by photovolta-m-metry 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.
%K Titanium dioxide
%K platinum
%K galvanic replacement
%K electrocatalysis
%K photoelectrocatalysis
%U http://www.jese-online.org/Articles/Vol_02/No_4/pdf/jESE_Vol2_No4_p155-169_2012.pdf