Strictly potentiostatic current oscillations during bulk CO electro-oxidation on platinum in the presence of inhibiting anions

Souradip Malkhandi; Antoine Bonnefont; Katharina Krischer

doi:10.1016/j.elecom.2005.04.022

Strictly potentiostatic current oscillations during bulk CO electro-oxidation on platinum in the presence of inhibiting anions

Souradip Malkhandi, Antoine Bonnefont, Katharina Krischer

Associate Professorship of Technical Physics

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

We investigate bulk CO electrooxidation on a rotating Pt disk electrode in concentrated acidic electrolytes containing small amounts of BF4- anions with cyclic voltammetry and potentiostatic measurements. Under potentiodynamic conditions, the average reactivity decreases with increasing BF4 - concentration. For fixed applied potential strictly potentiostatic current oscillations were observed. Both observations are reproduced with a mean field model for CO electrooxidation in which the anions are assumed to competitively adsorb on free electrode sites while the electrode potential is treated as a parameter. Bulk CO electrooxidation on Pt in the presence of inhibiting anions is thus an example of an electrochemical oscillator with purely chemical feedback loops.

Original language	English
Pages (from-to)	710-716
Number of pages	7
Journal	Electrochemistry Communications
Volume	7
Issue number	7
DOIs	https://doi.org/10.1016/j.elecom.2005.04.022
State	Published - Jul 2005

Keywords

Anion adsorption
Carbon monoxide oxidation
Cyclic voltammetry
Oscillations
Tetrafluoroboric acid

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10.1016/j.elecom.2005.04.022

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title = "Strictly potentiostatic current oscillations during bulk CO electro-oxidation on platinum in the presence of inhibiting anions",

abstract = "We investigate bulk CO electrooxidation on a rotating Pt disk electrode in concentrated acidic electrolytes containing small amounts of BF4- anions with cyclic voltammetry and potentiostatic measurements. Under potentiodynamic conditions, the average reactivity decreases with increasing BF4 - concentration. For fixed applied potential strictly potentiostatic current oscillations were observed. Both observations are reproduced with a mean field model for CO electrooxidation in which the anions are assumed to competitively adsorb on free electrode sites while the electrode potential is treated as a parameter. Bulk CO electrooxidation on Pt in the presence of inhibiting anions is thus an example of an electrochemical oscillator with purely chemical feedback loops.",

keywords = "Anion adsorption, Carbon monoxide oxidation, Cyclic voltammetry, Oscillations, Tetrafluoroboric acid",

author = "Souradip Malkhandi and Antoine Bonnefont and Katharina Krischer",

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T1 - Strictly potentiostatic current oscillations during bulk CO electro-oxidation on platinum in the presence of inhibiting anions

AU - Malkhandi, Souradip

AU - Bonnefont, Antoine

AU - Krischer, Katharina

N1 - Funding Information: This work was supported by the Deutsche Forschungsgemeinschaft (DFG) through a Research Grant.

PY - 2005/7

Y1 - 2005/7

N2 - We investigate bulk CO electrooxidation on a rotating Pt disk electrode in concentrated acidic electrolytes containing small amounts of BF4- anions with cyclic voltammetry and potentiostatic measurements. Under potentiodynamic conditions, the average reactivity decreases with increasing BF4 - concentration. For fixed applied potential strictly potentiostatic current oscillations were observed. Both observations are reproduced with a mean field model for CO electrooxidation in which the anions are assumed to competitively adsorb on free electrode sites while the electrode potential is treated as a parameter. Bulk CO electrooxidation on Pt in the presence of inhibiting anions is thus an example of an electrochemical oscillator with purely chemical feedback loops.

AB - We investigate bulk CO electrooxidation on a rotating Pt disk electrode in concentrated acidic electrolytes containing small amounts of BF4- anions with cyclic voltammetry and potentiostatic measurements. Under potentiodynamic conditions, the average reactivity decreases with increasing BF4 - concentration. For fixed applied potential strictly potentiostatic current oscillations were observed. Both observations are reproduced with a mean field model for CO electrooxidation in which the anions are assumed to competitively adsorb on free electrode sites while the electrode potential is treated as a parameter. Bulk CO electrooxidation on Pt in the presence of inhibiting anions is thus an example of an electrochemical oscillator with purely chemical feedback loops.

KW - Anion adsorption

KW - Carbon monoxide oxidation

KW - Cyclic voltammetry

KW - Oscillations

KW - Tetrafluoroboric acid

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DO - 10.1016/j.elecom.2005.04.022

M3 - Article

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SN - 1388-2481

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SP - 710

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JO - Electrochemistry Communications

JF - Electrochemistry Communications

IS - 7

ER -

Strictly potentiostatic current oscillations during bulk CO electro-oxidation on platinum in the presence of inhibiting anions

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Keywords

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