Structure and Stability of Underpotentially Deposited Ag on Au(111) in Alkaline Electrolyte

Structure and Stability of Underpotentially Deposited Ag on Au(111) in Alkaline Electrolyte
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碱性电解液中 Au(111) 上欠电位沉积银的结构和稳定性

DOI:
10.1021/acs.jpcc.5b12773
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发表时间:
2016
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Sisson N
Sisson N
中科院分区:
--
文献类型:
--
作者:
Sisson N

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结合原位表面X射线散射(SXS)和循环伏安法(CV)测量,研究了电极转移到碱性电解液(0.1 M KOH)中后,欠电位沉积(UPD)Ag层在Au(111)上的结构和行为。在浸入0.1 M KOH电解液之前,使用来自0.05 M H2SO4+ 1 mM Ag2SO4电解液的Ag的UPD在Au(111)上形成Ag的单层和双层膜。SXS数据的分析表明,虽然双层Ag膜在转移到碱性电解质时是稳定的,但Ag单层膜在转移过程中或转移过程中重新排序为部分双层结构。Ag修饰的Au(111)电极显示出与Ag单晶电极表面相似的OH吸附电位响应。
A combination of in situ surface X-ray scattering (SXS) and cyclic voltammetry (CV) measurements have been performed to understand the structure and behavior of underpotentially deposited (UPD) Ag layers on Au(111) following transfer of the electrode to alkaline electrolyte (0.1 M KOH). UPD of Ag from 0.05 M H2SO4+ 1 mM Ag2SO4electrolyte was used to form a monolayer and bilayer film of Ag on Au(111) before immersion into 0.1 M KOH electrolyte. Analysis of the SXS data shows that, while the bilayer Ag film is stable upon transfer to the alkaline electrolyte, the Ag monolayer film reorders to a partial bilayer structure upon or during the transfer process. The Ag-modified Au(111) electrode shows a potential response for OH–adsorption that is similar to that of Ag single crystal electrode surfaces.
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