Oxygen as redox mediator in scanning electrochemical microscopy. Application to the study of localised acid attack of marble
Oxygen as redox mediator in scanning electrochemical microscopy. Application to the study of localised acid attack of marble
Oxygen from air-saturated aqueous solutions was employed as redox mediator in SECM experiments. Accurate approach curves under negative-feedback conditions were obtained using platinum and gold microelectrodes. Imaging experiments were also carried out, using a 2.5 mum gold microelectrode and oxygen that acted as distance mediator. The topographic images of a glass surface and that of a marble surface prior and after localised acid attack were recorded. High concentrations of hydrogen ions were produced locally, at the microelectrode tip held 3 mum above the marble surface, by applying a large enough positive potential within the oxygen evolution region. Under these conditions, the dissolution of CaCO3 occurred. Pits were produced, and the crater volumes thus obtained were linearly dependent on the electrolysis time.
cartilage, reduction, ion
153-161
Bragato, C.
20ddc512-bf38-4e7e-adbf-4e895064b005
Daniele, S.
bc265396-aa03-4b2f-a87b-79cce8951da8
Baldo, M.A.
7365b366-e490-4b88-b54a-382186c815c7
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
1 March 2002
Bragato, C.
20ddc512-bf38-4e7e-adbf-4e895064b005
Daniele, S.
bc265396-aa03-4b2f-a87b-79cce8951da8
Baldo, M.A.
7365b366-e490-4b88-b54a-382186c815c7
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Bragato, C., Daniele, S., Baldo, M.A. and Denuault, G.
(2002)
Oxygen as redox mediator in scanning electrochemical microscopy. Application to the study of localised acid attack of marble.
Annali di Chimica, 92 (3), .
Abstract
Oxygen from air-saturated aqueous solutions was employed as redox mediator in SECM experiments. Accurate approach curves under negative-feedback conditions were obtained using platinum and gold microelectrodes. Imaging experiments were also carried out, using a 2.5 mum gold microelectrode and oxygen that acted as distance mediator. The topographic images of a glass surface and that of a marble surface prior and after localised acid attack were recorded. High concentrations of hydrogen ions were produced locally, at the microelectrode tip held 3 mum above the marble surface, by applying a large enough positive potential within the oxygen evolution region. Under these conditions, the dissolution of CaCO3 occurred. Pits were produced, and the crater volumes thus obtained were linearly dependent on the electrolysis time.
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Published date: 1 March 2002
Keywords:
cartilage, reduction, ion
Identifiers
Local EPrints ID: 19685
URI: http://eprints.soton.ac.uk/id/eprint/19685
ISSN: 0003-4592
PURE UUID: f5931976-bbd6-4830-9fd9-4027667a3741
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Date deposited: 16 Feb 2006
Last modified: 09 Jan 2022 02:43
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Contributors
Author:
C. Bragato
Author:
S. Daniele
Author:
M.A. Baldo
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