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

Hideo Naohara, Shen Ye, Kohei Uosaki

Research output: Contribution to journalConference article

48 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume154
Issue number1-2
DOIs
Publication statusPublished - 1999 Aug
Externally publishedYes
EventProceedings of the 1998 2nd Conference on Surface Characterization of Adsorption and Interfacial Reactions - Keanhou-Kona, HI, USA
Duration: 1998 Jan 111998 Jan 16

Keywords

  • Electrochemical deposition
  • Electrochemical quartz crystal microbalance (EQCM)
  • Gold single crystal electrode
  • In situ scanning tunneling microscopy (STM)
  • Palladium

ASJC Scopus subject areas

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

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