离子液体中Au(111)和Pt(111)表面Ge欠电位沉积的现场STM研究

doi:10.13208/j.electrochem.130605

电化学（中英文） ›› 2014, Vol. 20 ›› Issue (1): 12-16. doi: 10.13208/j.electrochem.130605

离子液体中Au(111)和Pt(111)表面Ge欠电位沉积的现场STM研究

谢旭芬，颜佳伟^*，梁景洪，李纪军，张梦，毛秉伟

厦门大学固体表面物理化学国家重点实验室，化学化工学院化学系，福建厦门 361005

收稿日期:2013-06-05 修回日期:2013-07-16 出版日期:2014-02-25 发布日期:2014-02-24
通讯作者: 颜佳伟 E-mail:jwyan@xmu.edu.cn
基金资助:
福建省自然科学基金（No. 2012J01054）、国家自然科学基金（No. 20973144）及中央高校基本科研业务费专项资金(No. 2012121026)资助

Underpotential deposition of Germanium on Au(111) and Pt(111) surfaces in Ionic Liquids

XIE Xu-fen, YAN Jia-wei^*, LIANG Jing-hong, LI Ji-jun, ZHANG Meng, MAO Bing-wei

State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Received:2013-06-05 Revised:2013-07-16 Published:2014-02-25 Online:2014-02-24
Contact: YAN Jia-wei E-mail:jwyan@xmu.edu.cn

摘要/Abstract

摘要： 本文研究BMIPF₆离子液体中Au(111)和Pt(111)表面Ge的电沉积行为. 循环伏安法测试结果表明，在含0.1 mol·L^-1 GeCl₄的BMIPF₆溶液Au(111)和Pt(111)表面均有两个与Ge沉积过程相关的还原峰. 第一个还原峰包含了Ge⁴⁺还原成Ge²⁺及Ge的欠电位沉积，第二个还原峰对应Ge的本体沉积. 现场扫描隧道显微镜研究结果表明，Ge在Au(111)和Pt(111)表面均有两层欠电位沉积. 第一层欠电位沉积厚度约为0.25 nm、形貌平整、带有缝隙的亚单层结构. 第二层欠电位沉积形貌相对粗糙的点状团簇结构. 该欠电位沉积过程伴随表面合金化.

关键词: Ge, Au(111), Pt(111), 欠电位沉积, 扫描隧道显微镜, 离子液体

Abstract: The underpotential deposition (UPD) of germanium (Ge) in BMIPF₆ ionic liquids on Au(111) and Pt(111) surfaces have been investigated by cyclic voltammetry (CV) and in-situ scannin tunneling microscopy (STM). The CV results show that there are two reduction peaks related to the electrodeposition of Ge. The first reduction peak appeared in the CV curve may cover the transformation of Ge⁴⁺ to Ge²⁺ and the UPD of Ge. The second reduction peak corresponds to the bulk deposition of Ge. In-situ STM study suggests that the two UPD layers of Ge are formed on Au(111) and Pt(111) surfaces. The first UPD layer is a film-like flat sub-monolayer with the thickness of 0.25 nm and some cracks. The second UPD layer is distributed on the first layer, which consists of some small Ge clusters with relatively rough morphology. The second UPD accompanies with surface alloying.

Key words: Germanium, Au(111), Pt(111), underpotential deposition, in-situ STM, ionic liquids

中图分类号:

O646

谢旭芬，颜佳伟*，梁景洪，李纪军，张梦，毛秉伟. 离子液体中Au(111)和Pt(111)表面Ge欠电位沉积的现场STM研究[J]. 电化学（中英文）, 2014, 20(1): 12-16.

XIE Xu-fen, YAN Jia-wei*, LIANG Jing-hong, LI Ji-jun, ZHANG Meng, MAO Bing-wei. Underpotential deposition of Germanium on Au(111) and Pt(111) surfaces in Ionic Liquids[J]. Journal of Electrochemistry, 2014, 20(1): 12-16.

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https://electrochem.xmu.edu.cn/CN/Y2014/V20/I1/12

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离子液体中Au(111)和Pt(111)表面Ge欠电位沉积的现场STM研究

Underpotential deposition of Germanium on Au(111) and Pt(111) surfaces in Ionic Liquids

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