Electroreduction of oxygen at tungsten oxide modified carbon-supported RuSex nanoparticles
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WO3-modified carbon-supported bi-component ruthenium–selenium, RuSex (Ru, 20; Se, 1 wt%), nanoparticles were dispersed in the form of Nafion-containing inks on glassy carbon electrodes to produce electrocatalytic interfaces reactive towards electroreduction of dioxygen in acid medium (0.5 mol dm−3 H2SO4). It was apparent from the rotating disk voltammetric experiments that the reduction of oxygen proceeded at WO3-modified electrocatalyst at more than 100 mV more positive potential when compared to bare (WO3-free) RuSex system (that had been prepared under analogous conditions and deposited at the same loading of 156 μg cm−2). The ring-disk rotating voltammetric measurements show that, while the production of hydrogen peroxide intermediate was significantly lower, the kinetic parameter (heterogeneous rate constant) for the oxygen reduction was higher for WO3-modified RuSex (relative to bare RuSex). Comparison was also made to highly-efficient Vulcan-supported Pt or Pt/Co nanoparticles: while the half-wave potential for the oxygen reduction at WO3-modified carbon-supported RuSex was still more negative relative to the potentials characteristic of Pt-based electrocatalysts, the oxygen reduction rotating disk voltammetric current densities (measured at 1600 rpm) were almost identical.
KeywordsOxygen reduction Rotating disk voltammetry Acid electrolyte Ruthenium–selenium nanoparticles Tungsten oxide
This work was supported by the Network Efficient Oxygen Reduction for Electrochemical Energy Conversion (coordinated by ZSW, Ulm, Germany). The Warsaw group acknowledges partial support from Ministry of Science and Higher Education (Poland) under the grant N204 164 32/4284. Helpful discussions with Prof. H. Tributsch of Hahn-Meitner-Institut, Berlin are appreciated.
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