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Parmon, Valentin N.
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article
Hydrogen electrooxidation over palladium-gold alloy
Abstract
<p>Palladium gold alloy powder (PdAu <sub>2</sub>) was synthesized by reduction of the [Pd(NH <sub>3</sub>) <sub>4</sub>][AuCl <sub>4</sub>] <sub>2</sub> complex with H <sub>2</sub> at 90°C, and then was additionally heated in a C <sub>2</sub>H <sub>4</sub> (PdAu <sub>2</sub>-C <sub>x</sub>) or H <sub>2</sub> flow (PdAu <sub>2</sub>-H <sub>2</sub>) at 300°C. The samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and by a set of electrochemical methods. The Pd:Au ratio on the surface of the PdAu <sub>2</sub> alloy suffers marginal changes after heating under C <sub>2</sub>H <sub>4</sub> atmosphere, and decreases as a result of heating in a H <sub>2</sub> flow. Hydrogen oxidation reaction (HOR) over the catalysts was studied using rotating disk electrode at 25°C in 0.1 M HClO <sub>4</sub> in pure H <sub>2</sub> and in the presence of 1100 ppm of CO. Heat-treatment of the PdAu <sub>2</sub> alloy under H <sub>2</sub> does not improve its HOR activity and CO tolerance (normalized to Pd and total metal surface area), while the PdAu <sub>2</sub>-C <sub>x</sub> catalyst exhibits substantially enhanced catalytic performance in the HOR both in the absence and in the presence of CO as compared to the parent PdAu <sub>2</sub> alloy. The enhanced activity of the C <sub>2</sub>H <sub>4</sub>-treated PdAu <sub>2</sub> alloy is explained by the promoting action of carbon atoms incorporated into the alloy structure during treatment under C <sub>2</sub>H <sub>4</sub> atmosphere. This supposition is approved by the fact that mild oxidative treatment of the PdAu <sub>2</sub>-C <sub>x</sub> sample degrades notably its catalytic activity.</p>