Scanning electrochemical microscopy: potentiometric probing of ion fluxes
Scanning electrochemical microscopy: potentiometric probing of ion fluxes
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.
diffusion layer, beam deflection, microelectrode probe, polyaniline, behavior, ph, voltammetry, resolution, electrodes, reduction
23-35
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Frank, M.H.T.
26626d27-ea51-4a75-bf7e-bce89c39403e
Peter, L.M.
a699c8d3-512e-43c4-ad64-7cb5d0694a87
1992
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Frank, M.H.T.
26626d27-ea51-4a75-bf7e-bce89c39403e
Peter, L.M.
a699c8d3-512e-43c4-ad64-7cb5d0694a87
Denuault, G., Frank, M.H.T. and Peter, L.M.
(1992)
Scanning electrochemical microscopy: potentiometric probing of ion fluxes.
Faraday Discussions, (94), .
(doi:10.1039/FD9929400023).
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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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
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Date deposited: 08 Apr 2011 08:42
Last modified: 15 Mar 2024 02:44
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Contributors
Author:
M.H.T. Frank
Author:
L.M. Peter
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