Potential and Concentration Dependent Electrochemical Dealloying of Al2Au in Sodium Chloride Solutions

Electrochemical dealloying of a single-phase Al2Au alloy in sodium chloride solutions has been investigated considering influence of potential and electrolyte concentration. Both open-circuit potentials and corrosion potentials of Al2Au decrease with increasing electrolyte concentration and temperat...

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Bibliographic Details
Published inJournal of physical chemistry. C Vol. 116; no. 9; pp. 5689 - 5699
Main Authors Xu, Junling, Wang, Yan, Zhang, Zhonghua
Format Journal Article
LanguageEnglish
Published Columbus, OH American Chemical Society 08.03.2012
Subjects
Applied sciences
Chemical and electrochemical properties
Exact sciences and technology
Metals. Metallurgy
Potentiostatic method
Corrosion potential
Electrochemical method
Gold alloy
Concentration effect
Adatoms
Aluminium alloy
Surface diffusion
Dealloying
Activation energy
Saline solution
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Summary:Electrochemical dealloying of a single-phase Al2Au alloy in sodium chloride solutions has been investigated considering influence of potential and electrolyte concentration. Both open-circuit potentials and corrosion potentials of Al2Au decrease with increasing electrolyte concentration and temperature. The overpotential and electrolyte concentration have a significant influence on dealloying behaviors of Al2Au, such as steady-state current density and dealloying duration. Nanoporous gold (NPG) can be fabricated by potentiostatic dealloying of Al2Au in the NaCl solutions. Moreover, surface diffusion evaluation demonstrates that there exist good linear relationships between the logarithm of surface diffusivities of Au adatoms (Auad) and overpotential, and between the surface diffusivities of Auad and electrolyte concentration. In addition, the activation energy decreases with increasing overpotential or chloride ion concentration.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp210488t