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

Authors

Xu-fen XIE, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Jia-wei YAN, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;Follow
Jing-hong LIANG, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Ji-jun LI, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Meng ZHANG, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Bing-wei MAO, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;

Corresponding Author

Jia-wei YAN(jwyan@xmu.edu.cn)

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.

Graphical Abstract

Keywords

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

DOI Link

https://doi.org/10.13208/j.electrochem.130605

Publication Date

2014-02-25

Online Available Date

2014-02-24

Revised Date

2013-07-16

Received Date

2013-06-05

Recommended Citation

Xu-fen XIE, Jia-wei YAN, Jing-hong LIANG, Ji-jun LI, Meng ZHANG, Bing-wei MAO. Underpotential deposition of Germanium on Au(111) and Pt(111) surfaces in Ionic Liquids[J]. Journal of Electrochemistry, 2014 , 20(1): 12-16.
DOI: 10.13208/j.electrochem.130605
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/3