Copper underpotential deposition on gold in the presence of polyethylene glycol and chloride

Yong Da Chiu, Wei Ping Dow, Yung Fang Liu, Yuh-Lang Lee, Shueh Lin Yau, Su Mei Huang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Many articles have shown that polyethylene glycol (PEG), when combined with chloride ions, is a strong suppressor of copper overpotential deposition (OPD) on a copper substrate. However, few articles have explored the roles of PEG and chloride ions in copper underpotential deposition (UPD) when the cathodic substrate was polycrystalline gold. The individual roles and the interactions of PEG and chloride ions during Cu UPD on a polycrystalline gold electrode were characterized using cyclic voltammetry (CV). According to the CV patterns, a small amount of chloride ions strongly facilitated the Cu UPD at a more positive potential; PEG alone exhibited a similar CV pattern to that of the additive-free case. PEG significantly promoted the accelerating effect of chloride ions on Cu UPD, a result that is the opposite of what occurred during Cu OPD. A mechanism by which PEG-Cl accelerates Cu UPD was proposed. This mechanism also indirectly suggests that the suppressor of Cu OPD should be PEG-Cu+-Cl, which could not form during Cu UPD on the polycrystalline gold electrode.

Original languageEnglish
Pages (from-to)3416-3426
Number of pages11
JournalInternational Journal of Electrochemical Science
Volume6
Issue number8
Publication statusPublished - 2011 Aug 1

All Science Journal Classification (ASJC) codes

  • Electrochemistry

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