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Physico–chemical Modelling of Adlayer Phase Formation via Surface–limited Reactions of Copper in Relation to Sequential Electrodeposition of Multilayered Platinum on Crystalline Gold

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.electacta.2014.09.086
Keywords
  • Underpotential Deposition
  • Surface–Limited Redox–Replacement
  • Multilayered Platinum Nanostructures
  • Adsorption Isotherms
  • Kinetics
Disciplines
  • Chemistry
  • Philosophy

Abstract

Abstract Electrochemical physico-chemical models, describing isothermically surface coverage dependency with electrode potential of underpotentially deposited Cu adlayers (CuUPD) as well as successive surface-limited redox replacement (SLRR) reactions between CuUPD and PtCl62–, to form multilayered Pt deposits on crystalline Au, have been explored. Modelling of such phase formation phenomena take into account heterogeneity effects and extent of adatom interactions within the adlayers on the base Au substrate and gradually formed Pt multilayered deposits. Insights on exchanged electrons, phenomenological reaction kinetics and Gibbs free energy variations during various deposition stages involving SLRR reactions are divulged.

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