The interfacial capacitance of Rh(111) in HCl solutions

T. Pajkossy, Dieter M. Kolb

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The impedance spectra of Rh(111) in aqueous HCl solutions have been measured as function of potential. In the double layer region, just as for other platinum group metals, the equivalent circuit of the interface is a circuit of a Rad-W-Cad element combination parallely connected to a Cdl capacitance; whereas at the H+/Cl- adsorbate exchange peak an additional parallel Rad,2-Cad,2 branch appears in the equivalent circuit. The (Rad-W-Cad) and the Rad,2-Cad,2 branches were demonstrated to be due to chloride and hydrogen adsorption, respectively. Due to the same anion appearing in the charging of Cad and Cdl the two branches are coupled to each other.

Original languageEnglish
Pages (from-to)3594-3599
Number of pages6
JournalElectrochimica Acta
Volume54
Issue number13
DOIs
Publication statusPublished - May 1 2009

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Equivalent circuits
Capacitance
Hydrochloric Acid
Adsorbates
Platinum
Anions
Negative ions
Metals
Adsorption
Hydrogen
Networks (circuits)

Keywords

  • Adsorption
  • Capacitance
  • Charge
  • Double layer
  • Interface

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

The interfacial capacitance of Rh(111) in HCl solutions. / Pajkossy, T.; Kolb, Dieter M.

In: Electrochimica Acta, Vol. 54, No. 13, 01.05.2009, p. 3594-3599.

Research output: Contribution to journalArticle

Pajkossy, T. ; Kolb, Dieter M. / The interfacial capacitance of Rh(111) in HCl solutions. In: Electrochimica Acta. 2009 ; Vol. 54, No. 13. pp. 3594-3599.
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