Abstract
AbstractToward the aim of better understanding of metal–support interactions in oxide‐supported Pt electrocatalysts, planar Pt/TiO2 model catalyst electrodes that combine high conductivity and direct Pt–TiO2 interactions are prepared and characterized. These consist of thin TiO2 films decorated with Pt nanoparticles on a glassy carbon substrate. TiO2 films are deposited by using a potential‐induced sol–gel process and subsequently functionalized with Pt nanoparticles, by electrochemical Pt deposition, deposition of pre‐formed Pt nanoparticles or by photo‐assisted local reduction of Pt ions. Scanning electron microscopy, transmission electron microscopy and X‐ray photoelectron spectroscopy are used for structural and electronic characterization of the model catalyst electrodes, as are cyclic voltammetry, electrooxidation of pre‐adsorbed CO and O2 reduction for evaluating their electrochemical/electrocatalytic properties. The impact of the Pt deposition method, of particle size effects and of metal–support interactions on the electrochemical properties and the catalytic activity/selectivity of these systems is discussed.
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