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Titolo:
THE STEADY-STATE CURRENT FOR A RING-LIKE MICROELECTRODE UNDER NON-DIFFUSION-CONTROLLED CONDITIONS
Autore:
PHILLIPS CG; STONE HA;
Indirizzi:
UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,PHYSIOL FLOW STUDIES GRP LONDON SW7 2BY ENGLAND UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT MATH LONDON SW7 2BY ENGLAND HARVARD UNIV,DIV APPL SCI CAMBRIDGE MA 02138
Titolo Testata:
Journal of electroanalytical chemistry [1992]
fascicolo: 1-2, volume: 396, anno: 1995,
pagine: 277 - 283
Fonte:
ISI
Lingua:
ENG
Keywords:
RING-LIKE MICROELECTRODE; STEADY-STATE CURRENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
C.G. Phillips e H.A. Stone, "THE STEADY-STATE CURRENT FOR A RING-LIKE MICROELECTRODE UNDER NON-DIFFUSION-CONTROLLED CONDITIONS", Journal of electroanalytical chemistry [1992], 396(1-2), 1995, pp. 277-283

Abstract

The steady-state current for a 'ring-like' microelectrode is considered, when the electrode reaction rate is not sufficiently large that the diffusion of the electroactive species is the rate-limiting transport process. This regime is particularly relevant for micro-ring electrodes (which the present formulation includes), because the criterion for diffusion-limited transport is much more stringent for a thin micro-ring electrode than for a micro-disc of comparable size. First an approximate solution is presented for the steady-state current for a ring-like microelectrode, valid for any value of the electrode reaction rate provided the ring is thin. For the special case of a thin, plane-mounted micro-ring electrode, numerical results are given and the surfacecurrent density distribution is shown. In this case the total currentis found to be in close agreement with a semi-empirical approximationdue to A. Szabo (J. Phys. Chem., 91 (1987) 3108). A micro-ring electrode with an arbitrary ratio of inner to outer radius is then considered, and the steady-state current is calculated numerically as a function of the electrode reaction rate for a range of geometries, extending from a complete disc to a thin ring.

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Documento generato il 04/04/20 alle ore 02:52:21