Deposition of platinum monolayers on gold

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Deposition of small amount of Pt is reported onto polycrystalline Au from H2PtCl6-containing solutions. Spontaneous deposition, yielding about 5% of a fullpacked 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.

Original languageEnglish
Pages (from-to)2453-2459
Number of pages7
JournalJournal of Solid State Electrochemistry
Volume15
Issue number11-12
DOIs
Publication statusPublished - Dec 2011

Fingerprint

Platinum
Gold
Monolayers
platinum
gold
Atoms
atoms
Networks (circuits)
Cyclic voltammetry
Oxidation
requirements
oxidation

Keywords

  • Adsorption
  • Gold
  • Monolayer
  • Platinum
  • Spontaneous Pt deposition
  • Underpotential deposition

ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Deposition of platinum monolayers on gold. / Bakos, I.; Szabó, S.; Pajkossy, T.

In: Journal of Solid State Electrochemistry, Vol. 15, No. 11-12, 12.2011, p. 2453-2459.

Research output: Contribution to journalArticle

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