Corresponding Author

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


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


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

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