Redox and electrocatalytic activity of copper in base at unusually low, premonolayer potentials.

Autor: Burke, L. Declan, Collins, John A., Murphy, Maria A.
Zdroj: Journal of Solid State Electrochemistry; Nov1999, Vol. 4 Issue 1, p34-41, 8p
Abstrakt: The assumption involved in this work is that the formation of monolayer (α) oxide species, which occurs on copper in base at 60 °C at ca. 0.5 V (RHE), is of little relevance to the electrocatalytic behaviour of the metal at low potentials. For many processes occurring at the interface in question the critical potential is ca. −0.1 V (RHE). This is the value where several electrocatalytic oxidation and reduction processes commence or terminate under potential sweep conditions; hydrous oxide films are reduced close to this value and it is possible to produce an active (but transient) state of the metal surface which exhibits a reversible redox response in this region. The results are rationalized in terms of the incipient hydrous oxide/adatom mediator model of electrocatalysis, and the nature of the active site material at the interface is discussed. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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