Multilayer hydrous oxide growth on copper in base and its correlation with previously reported electrocatalytic data for this electrode system |
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Authors: | L Declan Burke Maria A Murphy |
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Institution: | (1) Chemistry Department, University College Cork, Cork, Ireland e-mail: stch8028@bureau.ucc.ie Tel.: +353-21-902417; Fax: 353-21-274097, IE |
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Abstract: | A repetitive potential cycling procedure was used to produce a specific multilayer hydrous oxide film on copper in base at
60 °C. Such a deposit undergoes reduction in a quasi-reversible manner at ca. −0.1 V (RHE), i.e. at a potential that is unrelated
to Pourbaix data for copper but, as demonstrated previously, is of major significance with regard to the electrocatalytic
behaviour of this electrode system. In accordance with the incipient hydrous oxide/adatom mediator model of electrocatalysis,
an active surface state of the metal (Cu*) is assumed to be involved both in electrocatalysis and as a primary product in
the hydrous oxide reduction reaction. While the latter process occurs very rapidly at −0.1 V, it is not usually reversible
as it is accompanied by subsequent rapid loss of the active state of the metal. The same general approach was used previously
to explain the hydrous oxide and electrocatalytic behaviour of a range of noble metals.
Received: 28 August 1999 / Accepted: 11 November 1999 |
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Keywords: | Copper Hydrous oxide Anomalous behaviour Active state Electrocatalysis |
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