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• W2070861062 abstract "This paper describes electrocatalytic properties of composite films containing Pt microparticles dispersed in W(VI,V) oxide supports. The coatings were prepared electrochemically on graphite. Their behavior in 2 M H2SO4 is not a simple sum of the properties of the components. Even at low Pt levels in the coatings, the overpotential for hydrogen evolution is decreased by almost 500 mV compared to that at bare graphite. Although the catalytic effect is related to the presence of finely dispersed Pt, the interaction of the particles with the hydrogen tungsten oxide bronzes, which develop in the support, presumably weakens Pt-H bonds and favors hydrogen desorption. At moderate Pt loadings, the voltammetric reduction of oxygen begins at the most favorable potential available on Pt (0.5 V vs. SCE), and the ring-disk voltammetry does not show H2O2, as an intermediate or product. To utilize all of the three-dimensionally distributed Pt centers, the W(VI,V) oxide must be reduced partially, a condition that makes it highly reactive and non-blocking to protons and electrons. The activity of platinum for the voltammetric oxidation of methanol was enhanced by reductive conditioning at −0.2 V vs. SCE, where hydrogen spillover from Pt to yield hydrogen tungsten bronzes takes place. The latter process is believed to be responsible for the removal of passivating methanol residues, presumably by desorptive hydrogenation. At low ratios of Pt to W(VI,V) oxide, the system exhibits a notable catalytic reduction of otherwise highly irreversible chlorate." @default.
• W2070861062 created "2016-06-24" @default.
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• W2070861062 date "1989-02-01" @default.
• W2070861062 modified "2023-10-17" @default.
• W2070861062 title "Electrocatalytic properties of bifunctional Pt/W(VI,V) oxide microstructures electrodeposited on carbon substrates" @default.
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• W2070861062 doi "https://doi.org/10.1016/0022-0728(89)80040-3" @default.
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