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Issue 25, 2008

Electrochemical study on the adsorption of carbon oxides and oxidation of their adsorption products on platinumgroup metals and alloys

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Abstract

CO2 reduction and CO adsorption on noble metals (Pt, Rh, Pd) and their alloys (Pt–Rh, Pd–Pt, Pd–Rh, Pd–Pt–Rh) prepared as thin rough deposits have been studied by chronoamperometry (CA), cyclic voltammetry (CV) and the electrochemical quartz crystal microbalance (EQCM). The influence of alloy surface composition on the values of surface coverage, eps (electron per site) and potential of the oxidation of CO2 reduction and CO adsorption products is shown. The oxidation of the adsorbate on Pt–Rh alloys proceeds more easily (at lower potentials) than on pure metals. On the other hand, in the case of Pd–Pt and Pd–Rh alloys the adsorbate oxidation is more difficult and requires higher potentials than on Pt or Rh. The analysis of the EQCM signal is presented for the case of adsorption and oxidation of carbon oxide adsorption products on the electrodes studied. The comparison of adsorption parameters and the EQCM response obtained for platinum group metals and alloys leads to the conclusion that reduced CO2 cannot be totally identified with adsorbed CO.

Graphical abstract: Electrochemical study on the adsorption of carbon oxides and oxidation of their adsorption products on platinum group metals and alloys

Article information


Submitted
26 Nov 2007
Accepted
21 Apr 2008
First published
22 May 2008

Phys. Chem. Chem. Phys., 2008,10, 3752-3765
Article type
Paper

Electrochemical study on the adsorption of carbon oxides and oxidation of their adsorption products on platinum group metals and alloys

H. Siwek, M. Łukaszewski and A. Czerwiński, Phys. Chem. Chem. Phys., 2008, 10, 3752 DOI: 10.1039/B718286B

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