کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
185839 459604 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical and in-situ stm study of the surface alloy formation in the system Au(100)/Cd
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical and in-situ stm study of the surface alloy formation in the system Au(100)/Cd
چکیده انگلیسی


• The Cd UPD process is characterized by three adsorption/desorption current density peaks pairs before the Cd bulk deposition.
• A Au-Cd surface alloy, generated by a turnover mechanism, takes place at low underpotentials.
• The appearance of new peaks in the anodic stripping curves, can be attributed to the formation of other phases of a CdzAux alloy.

The Cd UPD process in the system Au(100)/Cd2+, SO42− and the involved Au-Cd surface alloy formation have been investigated, using conventional electrochemical techniques and in-situ STM analysis. The voltammetric experiences have shown three adsorption/desorption steps in the extended UPD range 0 ≤ ΔE/mV ≤ 800. The obtained desorption spectra indicate the formation of a surface alloy at low underpotentials and long polarization times. STM images have shown that the Cd deposition becomes evident at low underpotentials, with the nucleation of two-dimensional islands of monatomic height, which grow and coalesce up to a complete monolayer. At lower underpotentials, new islands nucleate on the monolayer previously formed, and grow acquiring a quadratic structure. The subsequent stripping of this film promotes morphological changes that are related to the dissolution of a Cd-Au surface alloy, which is consistent with the electrochemical experiences.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 130, 1 June 2014, Pages 164–169
نویسندگان
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