Double layer capacitance of the platinum group metals in the double layer region

T. Pajkossy, D. M. Kolb

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The interfacial impedance for the platinum-group metals, in simple binary electrolytes, in their so-called double layer region, is generally assumed to be ideally capacitive. In this communication, mainly addressing the Ir(1 0 0) / 0.1 M HCl system, we demonstrate that this is not necessarily the case when the anion of the solute is specifically adsorbed on the electrode. The frequency dependence is attributed to the relatively slow exchange of anions at the outer Helmholtz plane with the adsorbed ones (i.e. those at the inner Helmholtz plane).

Original languageEnglish
Pages (from-to)1171-1174
Number of pages4
JournalElectrochemistry Communications
Volume9
Issue number5
DOIs
Publication statusPublished - May 1 2007

Keywords

  • Adsorption
  • Double layer capacitance
  • Impedance
  • Interface
  • Iridium

ASJC Scopus subject areas

  • Electrochemistry

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