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Journal of Solid State Electrochemistry

, Volume 15, Issue 11–12, pp 2453–2459 | Cite as

Deposition of platinum monolayers on gold

  • István BakosEmail author
  • Sándor Szabó
  • Tamás Pajkossy
Original Paper

Abstract

Deposition of small amount of Pt is reported onto polycrystalline Au from H2PtCl6-containing solutions. Spontaneous deposition, yielding about 5% of a full-packed monolayer, has been found at the steady-state open circuit potential. Formation of a somewhat more dense, but still a partial monolayer could be observed at potentials between the steady-state open circuit potential and that of the onset of bulk deposition. A specific difference of monolayer and bulk deposition is that Pt surface area levels off with time and keeps increasing for the former and latter types of deposition, respectively. Pt monolayers with quite high coverages can be formed in a rather narrow, 20–30 mV potential region only. The surface areas of Pt and of the Pt-free Au have been simultaneously measured as cyclic voltammetry peak charges. From these measurements, the site requirement of the Pt atoms was determined to be around four; that is, each Pt atom blocks the oxidation of about four underlying/neighbouring Au atoms, implying their distant positions. Based on the results, Au surfaces coated with monoatomic Pt layers of quite high coverages can be prepared.

Keywords

Spontaneous Pt deposition Platinum Gold Monolayer Adsorption Underpotential deposition 

Notes

Acknowledgements

Financial support of the Hungarian Scientific Research Fund (OTKA-NKTH No. K-67874) is acknowledged.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • István Bakos
    • 1
    Email author
  • Sándor Szabó
    • 1
  • Tamás Pajkossy
    • 1
  1. 1.Institute of Materials and Environmental Chemistry, Chemical Research CenterHungarian Academy of SciencesBudapestHungary

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