An Atomistic Description of Dealloying
Top Cited Papers
- 1 January 2004
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 151 (10), C614-C626
- https://doi.org/10.1149/1.1784820
Abstract
We describe the microscopic details of porosity formation during dealloying as illuminated by a kinetic Monte Carlo model incorporating site coordination-dependent surface diffusion of all alloy components, and site coordination-dependent dissolution of the less-noble atoms. Our simulation model reproduces the entire range of phenomena associated with selective dissolution. These phenomena include composition and geometric restrictions on dealloying (parting limits), a composition-dependent critical potential, a passivation regime, a regime of steady-state dissolution flux, and porosity formation. We find that an intrinsic critical potential exists as a well-defined threshold potential separating surface passivation and porosity formation behaviors, but this intrinsic critical potential typically sits at values well below the experimental measurements of the empirical critical potential. Finally, by detailed examination of the temperature dependence of the dissolution flux, and also of the types of surface sites contributing to the dissolution flux, we predict that the binding energy of a terrace atom may be straightforwardly extracted from analysis of experimental polarization curves. © 2004 The Electrochemical Society. All rights reserved.Keywords
This publication has 27 references indexed in Scilit:
- Nanoporous Metals with Controlled Multimodal Pore Size DistributionJournal of the American Chemical Society, 2003
- Fabrication of nanoporous gold nanowiresApplied Physics Letters, 2002
- The Dealloying Critical PotentialJournal of the Electrochemical Society, 2002
- Evolution of nanoporosity in dealloyingNature, 2001
- Estimating surface diffusion coefficientsProgress in Surface Science, 1995
- Selective Anodic Dissolution of Cu‐Au Alloys: TEM and Current Transient StudyJournal of the Electrochemical Society, 1991
- Anodic dissoluton of binary single phase alloys—II. Behavior of CuPd, NiPd and AgAu in LiClElectrochimica Acta, 1986
- Anodic dissolution of binary single phase alloys—I. Surface composition changes on AgPd studied by Auger electron spectroscopyElectrochimica Acta, 1986
- Characteristic features of alloy polarization curvesCorrosion Science, 1983
- Corrosion micromorphology of noble metal alloys and depletion gildingNature, 1979