Electrochemical deposition of palladium on an Au(111) electrode: Effects of adsorbed hydrogen for a growth mode

Hideo Naohara, Shen Ye, Kohei Uosaki

研究成果: Conference article査読

49 被引用数 (Scopus)

抄録

Electrochemical deposition of palladium on an Au(111) electrode was investigated using in situ scanning tunneling microscopy (STM) and electrochemical quartz crystal microbalance (EQCM). STM images clearly showed that palladium deposition was proceeded two-dimensionally even in the relatively large overpotential region up to approx. +0.3 V (vs. RHE). Many nuclei were created, however, in the potential region where hydrogen adsorption took place, i.e. more negative than +0.3 V. EQCM measurement showed that the surface mass was steadily increased during the potential scan as far as the cathodic current flowed even in the potential region where hydrogen adsorption took place. The abrupt surface mass decrease and increase were observed, however, when the potential was stepped from +0.4 V (hydrogen adsorbed state) to +0.1 (hydrogen adsorbed state) and from +0.1 to +0.4 V, respectively, showing the desorption and adsorption of PdCl42- complex from the electrode surface upon hydrogen adsorption and desorption, respectively. These results support the model that the PdCl42- complex plays an important role to inhibit the three-dimensional growth and facilitate the two-dimensional growth.

本文言語English
ページ(範囲)201-208
ページ数8
ジャーナルColloids and Surfaces A: Physicochemical and Engineering Aspects
154
1-2
DOI
出版ステータスPublished - 1999 8
外部発表はい
イベントProceedings of the 1998 2nd Conference on Surface Characterization of Adsorption and Interfacial Reactions - Keanhou-Kona, HI, USA
継続期間: 1998 1 111998 1 16

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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