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Preparation of methanol oxidation electrocatalysts: ruthenium deposition on carbon-supported platinum nanoparticles

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Abstract

Methanol oxidation electrocatalysts were prepared from Ru electrochemical or spontaneous deposition on commercial-grade carbon-supported Pt nanoparticles (Pt-Vulcan XC72, E-TEK). The resulting Ru coverage was estimated by cyclic voltammetry in supporting electrolyte. The maximum electrocatalytic activity for methanol oxidation at room temperature was observed at lower Ru coverage for spontaneous deposition than for electrodeposition; θ Ru ∼10% vs ∼20%, respectively. On the other hand, higher current densities for methanol oxidation were obtained in the case of electrodeposited Ru. These two results were related to the presence of non-reducible ruthenium oxides in the spontaneous deposit. The present work provides evidence that (i) efficient DMFC electrocatalysts can be achieved by Ru deposition on Pt nanoparticles, and (ii) formation of a PtRu alloy is not a required condition for effective methanol electrooxidation.

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Authors and Affiliations

  1. Equipe Electrocatalyse, LACCO, UMR 6503 CNRS -, Université de Poitiers, 40, avenue du Recteur Pineau, 86022, Poitiers cedex, France

    F. Maillard, F. Gloaguen & J-M. Leger

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  1. F. Maillard
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  2. F. Gloaguen
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  3. J-M. Leger
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Correspondence to J-M. Leger.

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Maillard, F., Gloaguen, F. & Leger, JM. Preparation of methanol oxidation electrocatalysts: ruthenium deposition on carbon-supported platinum nanoparticles. Journal of Applied Electrochemistry 33, 1–8 (2003). https://doi.org/10.1023/A:1022906615060

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