Activation of Platinum-Based Centers through Modification with Metal Oxo Species Toward Electrocatalytic Oxidation of Dimethyl Ether and Methanol

摘要

We studied electrooxidation of dimethyl ether on Pt and PtRu nanoparticles: bare and deposited on ZrO_2 film. When compared to the behavior of bare Pt and PtRu nanoparticles (deposited on glassy carbon at the same loading of 100 μg cm~(-2)), the enhancement effect in the presence of ZrO_2 was demonstrated in terms of increases of electrocatalytic (voltammetric) currents recorded at room temperature (22 ℃) in 0.5 mol dm~(-3) H_2SO_4 containing 1.05 mol dm~(-3) dimethyl ether (DME). Introduction of the metal oxide (zirconia) nanostructures at the electrocatalytic interface should produce high population of reactive -OH groups favoring mobility of protons and inducing the oxidative removal of poisoning (CO-type) intermediates, at platinum and ruthenium sites of the deposited bimetallic PtRu nanoparticles.