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Scanning electrochemical microscopy: potentiometric probing of ion fluxes

Denuault, G., Frank, M.H.T. and Peter, L.M. (1992) Scanning electrochemical microscopy: potentiometric probing of ion fluxes Faraday Discussions, (94), pp. 23-35. (doi:10.1039/FD9929400023).

Record type: Article

Abstract

The scanning electrochemical microscope has been used to probe the diffusion layer by measuring the potential difference between a large reference electrode located in the bulk of the solution and a microindicator electrode positioned a few mum away from a substrate electrode. Ag micro-discs (10 and 50 mum diameter) have been used as potentiometric sensors to probe the concentration profile due to the diffusion of Ag+ to and from a planar Ag electrode. A similar experiment was carried out with an Ag microcylinder (50 mum diameter) as substrate electrode. In a separate set of experiments, Ag/AgCl microdiscs (10 and 50 mum diameter) were used to monitor the flux of Cl- consumed and generated by a film of polyaniline electrodeposited on Pt. The tip potential was recorded while cycling the potential of the PANI film past the first oxidation peak. Direct measurement of the ingress and egress of Cl- ions supports previously reported mechanisms for the oxidation of PANI films.

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More information

Published date: 1992
Additional Information: MA449
Keywords: diffusion layer, beam deflection, microelectrode probe, polyaniline, behavior, ph, voltammetry, resolution, electrodes, reduction

Identifiers

Local EPrints ID: 179275
URI: http://eprints.soton.ac.uk/id/eprint/179275
ISSN: 0301-7249
PURE UUID: a7603ef1-982a-4f42-a93c-427e710d6f0b
ORCID for G. Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 08 Apr 2011 08:42
Last modified: 18 Jul 2017 12:03

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Contributors

Author: G. Denuault ORCID iD
Author: M.H.T. Frank
Author: L.M. Peter

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