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Electrochemical behavior of Pd–Rh alloys

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Abstract

Pd–Rh alloys were prepared by electrochemical codeposition. Bulk compositions of the alloys were determined by the energy dispersive X-ray analysis method, while surface compositions were determined from the potential of the surface oxide reduction peak. Cyclic voltammograms, recorded in 0.5 M H2SO4 for Pd–Rh alloys of different bulk and surface compositions, are intermediate between curves characteristic of Pd and Rh. The influence of potential cycling on electrochemical properties and surface morphologies of the alloys was studied. Due to electrochemical dissolution of metals, both alloy surface and bulk become enriched with Pd. Carbon oxides were adsorbed at a constant potential from the range of hydrogen adsorption. The presence of adsorbed CO2 causes remarkable diminution of hydrogen adsorption but it does not significantly influence hydrogen insertion into the alloy bulk. On the other hand, in the presence of adsorbed CO, both hydrogen absorption and adsorption are strongly suppressed. Oxidative removal of the adsorbates results in a characteristic voltammetric peak, whose potential increases with the decrease in Rh surface content. Electron per site (eps) values calculated for the oxidation of the adsorbates change with alloy surface composition, more for CO2 than CO adsorption, indicating the variation of the structure and composition of CO2 and CO adsorption products. The course of the dependence of eps values on surface composition suggests that the products of CO2 and CO adsorption on Pd–Rh alloys are similar but not totally identical.

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Acknowledgements

This work was partially financially supported by the Department of Chemistry of Warsaw University and the Industrial Chemistry Research Institute.

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Authors and Affiliations

  1. Department of Chemistry, Warsaw University, Pasteura 1, 02-093, Warsaw, Poland

    M. Łukaszewski & A. Czerwiński

  2. Industrial Chemistry Research Institute, Rydygiera 8, 01-793, Warsaw, Poland

    A. Czerwiński

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  1. M. Łukaszewski
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  2. A. Czerwiński
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Correspondence to A. Czerwiński.

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Łukaszewski, M., Czerwiński, A. Electrochemical behavior of Pd–Rh alloys. J Solid State Electrochem 11, 339–349 (2007). https://doi.org/10.1007/s10008-006-0142-y

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  • DOI: https://doi.org/10.1007/s10008-006-0142-y

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