Underpotential Deposition of Silver on Au(111) from an Air‐ and Water‐Stable Ionic Liquid Visualized by In‐Situ STM,ChemElectroChem

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Underpotential Deposition of Silver on Au(111) from an Air‐ and Water‐Stable Ionic Liquid Visualized by In‐Situ STM
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-11-30 , DOI: 10.1002/celc.201801404
Maria R. Ehrenburg ₁ , Elena B. Molodkina ₁ , Peter Broekmann ₂ , Alexander V. Rudnev _{1,

2}

Affiliation

There is a steadily increasing interest in room‐temperature ionic liquids (ILs) as media for metal electrodeposition. However, the fundamental understanding of the underlying surface processes at the electrode/IL interface and of the initial stages of electrodeposition is still at a very preliminary stage. In this article, we investigate the underpotential deposition (upd) of Ag on a well‐defined Au(111) single crystal surface from an air‐ and water‐stable IL, 1‐butyl‐1‐methylpyrrolidinium dicyanamide [BMP][DCA]. By employing in‐situ scanning tunneling microscopy (STM), we could visualize individual stages of the Ag upd process as a function of the applied electrode potential and correlate voltammetric responses to the obtained STM data. The initial Ag upd process results in the formation of an Ag‐(4×4) lattice, which is further transformed into a pseudomorphic Ag‐(1×1) monolayer at the underpotential of ∼40 mV. The structural stability of the Au(111) surface in [BMP][DCA] is also examined in the absence of Ag⁺ ions in both the negative and positive potential regions.

中文翻译：

原位STM可视化空气和水稳定离子液体中Au（111）上银的电位不足沉积

室温离子液体（ILs）作为金属电沉积介质的兴趣在不断增长。但是，对电极/ IL界面下的基础表面过程以及电沉积初始阶段的基本了解仍处于非常初步的阶段。在本文中，我们研究了在空气和水稳定的IL，1-丁基-1-甲基吡咯烷鎓二氰胺[BMP] [DCA]上明确定义的Au（111）单晶表面上银的欠电势沉积（upd）。。通过采用原位扫描隧道显微镜（STM），我们可以将Ag upd过程的各个阶段可视化为所施加电极电位的函数，并将伏安响应与获得的STM数据相关联。最初的Ag upd过程导致形成Ag-（4×4）晶格，它在约40 mV的负电势下进一步转变为假晶Ag-（1×1）单层。在没有Ag的情况下，还检查了[BMP] [DCA]中Au（111）表面的结构稳定性负电位区域和正电位区域中的⁺离子。

更新日期：2018-11-30

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