Impedance aspects of anion adsorption on gold single crystal electrodes

T. Pajkossy, Thomas Wandlowski, Dieter M. Kolb

Research output: Article

203 Citations (Scopus)

Abstract

In order to explore the origins of the capacitance dispersion observed for single crystal electrodes, voltammetric and impedance measurements on Au(111) and Au(100), in the absence and the presence of specifically adsorbed anions, mostly Br-, have been carried out. Interfacial capacitances and rate coefficients characterizing the kinetics of adsorption have been evaluated from the impedance spectra. We present evidence that the double layer behaves as an ideal capacitance in the absence of specific adsorption. The approximation with a constant phase element yields an exponent larger than 0.99. The "capacitance dispersion" observed in the presence of specific adsorption is either assigned to a slow diffusion or adsorption process, or to transformations within the adlayer or the substrate surface.

Original languageEnglish
Pages (from-to)209-220
Number of pages12
JournalJournal of Electroanalytical Chemistry
Volume414
Issue number2
DOIs
Publication statusPublished - okt. 20 1996

Fingerprint

Gold
Anions
Capacitance
Negative ions
Single crystals
Adsorption
Electrodes
Kinetics
Substrates

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Impedance aspects of anion adsorption on gold single crystal electrodes. / Pajkossy, T.; Wandlowski, Thomas; Kolb, Dieter M.

In: Journal of Electroanalytical Chemistry, Vol. 414, No. 2, 20.10.1996, p. 209-220.

Research output: Article

Pajkossy, T. ; Wandlowski, Thomas ; Kolb, Dieter M. / Impedance aspects of anion adsorption on gold single crystal electrodes. In: Journal of Electroanalytical Chemistry. 1996 ; Vol. 414, No. 2. pp. 209-220.
@article{e98af4c4eb2948c2b33e10cdc5d16991,
title = "Impedance aspects of anion adsorption on gold single crystal electrodes",
abstract = "In order to explore the origins of the capacitance dispersion observed for single crystal electrodes, voltammetric and impedance measurements on Au(111) and Au(100), in the absence and the presence of specifically adsorbed anions, mostly Br-, have been carried out. Interfacial capacitances and rate coefficients characterizing the kinetics of adsorption have been evaluated from the impedance spectra. We present evidence that the double layer behaves as an ideal capacitance in the absence of specific adsorption. The approximation with a constant phase element yields an exponent larger than 0.99. The {"}capacitance dispersion{"} observed in the presence of specific adsorption is either assigned to a slow diffusion or adsorption process, or to transformations within the adlayer or the substrate surface.",
keywords = "Anion adsorption, Gold electrode, Impedance",
author = "T. Pajkossy and Thomas Wandlowski and Kolb, {Dieter M.}",
year = "1996",
month = "10",
day = "20",
doi = "10.1016/0022-0728(96)04700-6",
language = "English",
volume = "414",
pages = "209--220",
journal = "Journal of Electroanalytical Chemistry",
issn = "0022-0728",
publisher = "Elsevier Sequoia",
number = "2",

}

TY - JOUR

T1 - Impedance aspects of anion adsorption on gold single crystal electrodes

AU - Pajkossy, T.

AU - Wandlowski, Thomas

AU - Kolb, Dieter M.

PY - 1996/10/20

Y1 - 1996/10/20

N2 - In order to explore the origins of the capacitance dispersion observed for single crystal electrodes, voltammetric and impedance measurements on Au(111) and Au(100), in the absence and the presence of specifically adsorbed anions, mostly Br-, have been carried out. Interfacial capacitances and rate coefficients characterizing the kinetics of adsorption have been evaluated from the impedance spectra. We present evidence that the double layer behaves as an ideal capacitance in the absence of specific adsorption. The approximation with a constant phase element yields an exponent larger than 0.99. The "capacitance dispersion" observed in the presence of specific adsorption is either assigned to a slow diffusion or adsorption process, or to transformations within the adlayer or the substrate surface.

AB - In order to explore the origins of the capacitance dispersion observed for single crystal electrodes, voltammetric and impedance measurements on Au(111) and Au(100), in the absence and the presence of specifically adsorbed anions, mostly Br-, have been carried out. Interfacial capacitances and rate coefficients characterizing the kinetics of adsorption have been evaluated from the impedance spectra. We present evidence that the double layer behaves as an ideal capacitance in the absence of specific adsorption. The approximation with a constant phase element yields an exponent larger than 0.99. The "capacitance dispersion" observed in the presence of specific adsorption is either assigned to a slow diffusion or adsorption process, or to transformations within the adlayer or the substrate surface.

KW - Anion adsorption

KW - Gold electrode

KW - Impedance

UR - http://www.scopus.com/inward/record.url?scp=0030258154&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030258154&partnerID=8YFLogxK

U2 - 10.1016/0022-0728(96)04700-6

DO - 10.1016/0022-0728(96)04700-6

M3 - Article

AN - SCOPUS:0030258154

VL - 414

SP - 209

EP - 220

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 0022-0728

IS - 2

ER -