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CO oxidation on Pt-modified Rh(111) electrodes.

T H M Housmans1, J M Feliu, R Gómez

  • 1Schuit Institute of Catalysis, Laboratory of Inorganic, Chemistry and Catalysis, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands. T.H.M.Housmans@tue.nl

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|July 22, 2005
PubMed
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Platinum modification of Rhodium(111) electrodes significantly enhances carbon monoxide (CO) electro-oxidation. This study reveals improved kinetics and reduced reaction times on Pt-Rh(111) surfaces compared to pure Rh or Pt.

Area of Science:

  • Electrochemistry
  • Surface Science
  • Materials Science

Background:

  • The electro-oxidation of carbon monoxide (CO) is crucial for fuel cell technologies.
  • Rhodium(111) and Platinum(111) exhibit distinct catalytic properties for CO oxidation.
  • Understanding synergistic effects in bimetallic systems is key to catalyst design.

Purpose of the Study:

  • To investigate the electro-oxidation of CO on platinum-modified Rh(111) electrodes.
  • To characterize the structural evolution of platinum overlayers on Rh(111).
  • To evaluate the catalytic performance of Pt-Rh(111) for CO electro-oxidation.

Main Methods:

  • Cyclic voltammetry and chronoamperometry were employed to study CO electro-oxidation.
  • Platinum-modified Rh(111) electrodes (Pt_n-Rh(111)) were prepared via electrodeposition.

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  • Scanning Tunneling Microscopy (STM) was used to characterize surface morphology.

    • Main Results:

    • Pt modification enhanced hydrogen and (bi)sulfate adsorption/desorption on Rh(111).
    • STM revealed the formation of monoatomically high Pt islands that grow three-dimensionally.
    • CO stripping voltammetry showed enhanced CO electro-oxidation kinetics on Pt-Rh(111) with reduced onset potentials.
    • Pt4-Rh(111) exhibited significantly reduced CO oxidation reaction times compared to pure Rh(111) and Pt(111).

    Conclusions:

    • Platinum overlayers on Rh(111) create highly active sites for CO electro-oxidation.
    • The observed enhancement is attributed to synergistic effects between Pt and Rh.
    • Pt-Rh(111) systems demonstrate superior CO electro-oxidation performance compared to pure metals.