The interfacial capacitance of Rh(111) in HCl solutions

Tamás Pajkossy, Dieter M. Kolb

Research output: Contribution to journalArticle

17 Citations (Scopus)


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
Issue number13
Publication statusPublished - May 1 2009


  • Adsorption
  • Capacitance
  • Charge
  • Double layer
  • Interface

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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