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Electrochemical Layer-by-Layer Growth of Palladium on an Au(111) Electrode Surface : Evidence for Important Role of Adsorbed Pd Complex

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Title: Electrochemical Layer-by-Layer Growth of Palladium on an Au(111) Electrode Surface : Evidence for Important Role of Adsorbed Pd Complex
Authors: Naohara, Hideo Browse this author
Ye, Shen Browse this author
Uosaki, Kohei Browse this author →KAKEN DB
Issue Date: 28-May-1998
Publisher: American Chemical Society
Journal Title: Journal of Physical Chemistry B
Volume: 102
Issue: 22
Start Page: 4366
End Page: 4373
Publisher DOI: 10.1021/jp980624f
Abstract: The adsorption and electrochemical reduction of the tetrachloropalladate complex, PdCl4^[2-], on an Au(111) electrode in H2SO4 solution containing PdCl4^[2-] was investigated using an electrochemical quartz crystal microbalance (EQCM) and in situ electrochemical scanning tunneling microscopy (STM). The adlayer of PdCl4^[2-] with a (√7 x √7)R19.1° structure on the Au(111) substrate was observed by in situ STM measurement, and the amount of adsorbed PdCl4^[2-] determined by the EQCM measurement was in good agreement with that estimated from this adlayer structure. In situ STM observation showed also that the electrochemical deposition of palladium proceeded with an epitaxial layer-by-layer growth mode and the PdCl4^[2-] complex adsorbed on the deposited palladium layer with the same adlayer structure. The adsorption of the PdCl4^[2-] complex seemed to play an important role for the layer-by-layer growth of palladium in a large area, since it inhibits the vertical but favors the lateral growth of the palladium layer. The formation of the Pd(111) bulk phase and the surface structure of Pd(111) was confirmed by X-ray diffraction (XRD) and the underpotential deposition of copper, respectively.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 魚崎 浩平

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