Current distribution at a disk electrode during a current pulse

Paul Antohi, Daniel Alberto Scherson

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The spatio-temporal evolution of the current distribution at a disk electrode during a current pulse has been examined within the mathematical formalism introduced by Nişancioǧlu and Newman[J. Electrochem. Soc., 120, 1339 (1973)]. Under conditions in which the disk electrode-electrolyte interface can be represented by a capacitor (double layer) in parallel with a resistor (linearized faradaic process), the dominant contribution to the total disk current density, iT, immediately following application of the current step, is capacitive, iC. During this period, both iC and the significantly smaller faradaic component of iT, iF, are highly nonuniform over the disk surface, attaining maximum values at its edge. At longer times, iC decreases and iF increases, becoming the only contribution to iT when steady state is reached. Upon current interruption, the charged interface relaxes via two distinct pathways: a faradaic shorting of the double layer and a redistribution of the charge stored in the interfacial capacitor, which, for the electrolyte plate, generates current loops extending far into the solution that terminate near the edge of the disk electrode. This zero total current condition across the entire electrode leads to the development of a concentric ring, where iC and iF are equal in magnitude but opposite in sign, which propagates toward the center of the disk as steady state is approached.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume153
Issue number2
DOIs
Publication statusPublished - 2006 Jan 20
Externally publishedYes

Fingerprint

current distribution
Electrodes
electrodes
pulses
Electrolytes
Capacitors
electrolytes
Resistors
Current density
interruption
electrochemical capacitors
resistors
capacitors
current density
formalism
rings

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Current distribution at a disk electrode during a current pulse. / Antohi, Paul; Scherson, Daniel Alberto.

In: Journal of the Electrochemical Society, Vol. 153, No. 2, 20.01.2006.

Research output: Contribution to journalArticle

Antohi, Paul ; Scherson, Daniel Alberto. / Current distribution at a disk electrode during a current pulse. In: Journal of the Electrochemical Society. 2006 ; Vol. 153, No. 2.
@article{5d25b6b70dec486b93ba5e9360760bb2,
title = "Current distribution at a disk electrode during a current pulse",
abstract = "The spatio-temporal evolution of the current distribution at a disk electrode during a current pulse has been examined within the mathematical formalism introduced by Nişancioǧlu and Newman[J. Electrochem. Soc., 120, 1339 (1973)]. Under conditions in which the disk electrode-electrolyte interface can be represented by a capacitor (double layer) in parallel with a resistor (linearized faradaic process), the dominant contribution to the total disk current density, iT, immediately following application of the current step, is capacitive, iC. During this period, both iC and the significantly smaller faradaic component of iT, iF, are highly nonuniform over the disk surface, attaining maximum values at its edge. At longer times, iC decreases and iF increases, becoming the only contribution to iT when steady state is reached. Upon current interruption, the charged interface relaxes via two distinct pathways: a faradaic shorting of the double layer and a redistribution of the charge stored in the interfacial capacitor, which, for the electrolyte plate, generates current loops extending far into the solution that terminate near the edge of the disk electrode. This zero total current condition across the entire electrode leads to the development of a concentric ring, where iC and iF are equal in magnitude but opposite in sign, which propagates toward the center of the disk as steady state is approached.",
author = "Paul Antohi and Scherson, {Daniel Alberto}",
year = "2006",
month = "1",
day = "20",
doi = "10.1149/1.2140681",
language = "English",
volume = "153",
journal = "Journal of the Electrochemical Society",
issn = "0013-4651",
publisher = "Electrochemical Society, Inc.",
number = "2",

}

TY - JOUR

T1 - Current distribution at a disk electrode during a current pulse

AU - Antohi, Paul

AU - Scherson, Daniel Alberto

PY - 2006/1/20

Y1 - 2006/1/20

N2 - The spatio-temporal evolution of the current distribution at a disk electrode during a current pulse has been examined within the mathematical formalism introduced by Nişancioǧlu and Newman[J. Electrochem. Soc., 120, 1339 (1973)]. Under conditions in which the disk electrode-electrolyte interface can be represented by a capacitor (double layer) in parallel with a resistor (linearized faradaic process), the dominant contribution to the total disk current density, iT, immediately following application of the current step, is capacitive, iC. During this period, both iC and the significantly smaller faradaic component of iT, iF, are highly nonuniform over the disk surface, attaining maximum values at its edge. At longer times, iC decreases and iF increases, becoming the only contribution to iT when steady state is reached. Upon current interruption, the charged interface relaxes via two distinct pathways: a faradaic shorting of the double layer and a redistribution of the charge stored in the interfacial capacitor, which, for the electrolyte plate, generates current loops extending far into the solution that terminate near the edge of the disk electrode. This zero total current condition across the entire electrode leads to the development of a concentric ring, where iC and iF are equal in magnitude but opposite in sign, which propagates toward the center of the disk as steady state is approached.

AB - The spatio-temporal evolution of the current distribution at a disk electrode during a current pulse has been examined within the mathematical formalism introduced by Nişancioǧlu and Newman[J. Electrochem. Soc., 120, 1339 (1973)]. Under conditions in which the disk electrode-electrolyte interface can be represented by a capacitor (double layer) in parallel with a resistor (linearized faradaic process), the dominant contribution to the total disk current density, iT, immediately following application of the current step, is capacitive, iC. During this period, both iC and the significantly smaller faradaic component of iT, iF, are highly nonuniform over the disk surface, attaining maximum values at its edge. At longer times, iC decreases and iF increases, becoming the only contribution to iT when steady state is reached. Upon current interruption, the charged interface relaxes via two distinct pathways: a faradaic shorting of the double layer and a redistribution of the charge stored in the interfacial capacitor, which, for the electrolyte plate, generates current loops extending far into the solution that terminate near the edge of the disk electrode. This zero total current condition across the entire electrode leads to the development of a concentric ring, where iC and iF are equal in magnitude but opposite in sign, which propagates toward the center of the disk as steady state is approached.

UR - http://www.scopus.com/inward/record.url?scp=30644470281&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=30644470281&partnerID=8YFLogxK

U2 - 10.1149/1.2140681

DO - 10.1149/1.2140681

M3 - Article

AN - SCOPUS:30644470281

VL - 153

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 2

ER -