Mechanism for nucleation and growth of electrochemical palladium deposition on an Au(111) electrode

M. E. Quayum, Shen Ye, Kohei Uosaki

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

The initial kinetics of electrochemical deposition of palladium on an Au(111) electrode in 0.1 M H2SO4 solution containing K2PdCl4 have been investigated quantitatively by cyclic voltammetry (CV) and potentiostatic current transient measurements. A cathodic current maximum was observed in the initial stage of Pd deposition process in 0.1 mM K2PdCl4 solution. The analysis shows that the deposition of palladium in this solution proceeds by an instantaneous nucleation and two-dimensional (2D) growth mode. When the concentration of K2PdCl4 became higher, a potential-dependent cathodic current 'plateau' after the current maximum was observed. Simple nucleation-growth models cannot fit the transients in the region of the 'current plateau'. The present current transient results were discussed in comparison with the results obtained by in situ scanning tunneling microscopy (STM).

Original languageEnglish
Pages (from-to)126-132
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume520
Issue number1-2
DOIs
Publication statusPublished - 2002 Feb 22
Externally publishedYes

Keywords

  • Au(111) electrode
  • Cyclic voltammetry
  • Electrodeposition
  • Kinetics
  • Nucleation
  • Palladium
  • Transient methods
  • Underpotential deposition (upd)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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