Electrodeposition of Ag and Pd on a reconstructed Au(111) electrode surface studied by in situ scanning tunneling microscopy

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概要

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• Electrochemical deposition of Ag and potential-induced structural change of the deposited Ag layer on a 23 x √3 reconstructed surface of Au(111) electrode were followed by in situ scanning tunneling microscope (STM). A uniform Ag monolayer was formed on a reconstructed Au(111) surface in a 50 mM H2SO4 solution at +0.3 V (vs. Ag/AgCl) after adding a solution containing Ag2SO4 so that the concentration of Ag+ in the STM cell became ca. 2 μM. No characteristic height corrugation such as the Au reconstruction was observed on the surface, indicating that the lifting of the substrate Au reconstruction occurred by Ag deposition. The formed Ag monolayer was converted to a net-like shaped Ag nano-pattern of biatomic height when the potential was stepped from +0.3 V to -0.2 V in the solution containing 2 μM Ag+. This result indicates that the substrate Au(111)-(1 x 1) surface was converted to the reconstructed surface even in the presence of Ag adlayer. Quite different structure was observed for Pd deposition on a reconstructed surface of Au(111) electrode at +0.3 V and the origin for this difference between Ag and Pd deposition are discussed.

• Elsevier Ltd.の論文
• 2009-09-01

著者

• 高草木 達

  東京大学大学院理学系化学専攻

• Takakusagi Satoru

  Physical Chemistry Lab. Div. Of Chemistry Graduate School Of Sci. Hokkaido Univ. Sapporo 060-0810 Jp

• Takakusagi Satoru

  Physical Chemistry Laboratory Division Of Chemistry Graduate School Of Science Hokkaido University

• Uosaki K

  Hokkaido Univ. Sapporo

• Uosaki Kohei

  Physical Chemistry Laboratory Division Of Chemistry Graduate School Of Science Hokkaido University

• Uosaki Kohei

  Phyical Chemistry Laboratory Division Of Chemistry Graduate School Of Science Hokkaido University

• Umakoshi Keisuke

  Department Of Applied Chemistry Faculty Of Engineering Nagasaki University

• Uosaki Kohei

  Physical Chemistry Laboratory Department Of Chemistry Faculty Of Science Hokkaido University

• 高草木 達

  北海道大学触媒化学研究センター表面構造化学研究部門・構造制御反応場クラスター

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