The dealloying critical potential

Karl Sieradzki, N. Dimitrov, D. Movrin, C. McCall, N. Vasiljevic, J. Erlebacher

Research output: Contribution to journalArticlepeer-review

184 Scopus citations

Abstract

This paper reexamines the concept of the dealloying critical potential by considering the critical potential to be a kinetically controlled morphological transition dependent not only on extensive system parameters such as alloy and electrolyte composition, but also on the rate of application of an intrinsic parameter such as the potential ramp rate. In the limit of a quasi-static potential sweep rate, an expression for the critical potential is derived which considers both compositional and morphological fluctuations on the alloy surface at the incipient point of either stability (passivation) or instability (bulk dealloying). In addition, we present detailed critical potential results for the entire range of Ag-Au alloy compositions in x M AgClO4 + 1 M HClO4 and x M AgNO3 + 1 M HNO3(x = 10-4, 10-3, 10-2, 10-1, and 1). These results are shown be consistent with the expression for the critical potential. Finally, we present and discuss ancillary experiments examining the effect of potential sweep rate on the determination of the critical potential.

Original languageEnglish (US)
Pages (from-to)B370-B377
JournalJournal of the Electrochemical Society
Volume149
Issue number8
DOIs
StatePublished - Aug 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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