Anion-adsorption-related frequency-dependent double layer capacitance of the platinum-group metals in the double layer region

T. Pajkossy, D. M. Kolb

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The interfacial impedance for platinum-group metals in simple binary electrolytes, in their so-called double layer region, is generally assumed to be ideally capacitive. Using single crystalline platinum-group metals with various solutions we demonstrate that this is not necessarily the case when the anion of the solute is specifically adsorbed on the electrode. We attribute the frequency dependence of the interfacial capacitance to the relatively slow exchange of anions between the outer and inner Helmholtz planes.

Original languageEnglish
Pages (from-to)7403-7409
Number of pages7
JournalElectrochimica Acta
Volume53
Issue number25
DOIs
Publication statusPublished - Oct 30 2008

Fingerprint

Platinum
Anions
Capacitance
Negative ions
Metals
Adsorption
Electrolytes
Ion exchange
Crystalline materials
Electrodes

Keywords

  • Adsorption
  • Capacitance
  • Double layer
  • Impedance
  • Interface

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Anion-adsorption-related frequency-dependent double layer capacitance of the platinum-group metals in the double layer region. / Pajkossy, T.; Kolb, D. M.

In: Electrochimica Acta, Vol. 53, No. 25, 30.10.2008, p. 7403-7409.

Research output: Contribution to journalArticle

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