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

被引:10
|
作者
Ehrenburg, Maria R. [1 ]
Molodkina, Elena B. [1 ]
Broekmann, Peter [2 ]
Rudnev, Alexander, V [1 ,2 ]
机构
[1] Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, Leninskii Pr 31, Moscow 119071, Russia
[2] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland
基金
俄罗斯基础研究基金会; 瑞士国家科学基金会;
关键词
Au(111) single crystal; ionic liquids; materials science; scanning tunnelling microscopy; silver underpotential deposition; SCANNING-TUNNELING-MICROSCOPY; BUTYL-N-METHYLPYRROLIDINIUM; QUARTZ-CRYSTAL MICROBALANCE; ATOMIC-FORCE MICROSCOPY; ELECTROCHEMICAL DEPOSITION; AG; ELECTRODEPOSITION; SOLVENT; GOLD; AFM;
D O I
10.1002/celc.201801404
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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 x 4) lattice, which is further transformed into a pseudomorphic Ag-(1 x 1) monolayer at the underpotential of similar to 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.
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页码:1149 / 1156
页数:8
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