Generation of active surface states of gold and the role of such states in electrocatalysis

Burke, L Declan & O'Mullane, Anthony P (2000) Generation of active surface states of gold and the role of such states in electrocatalysis. Journal of Solid State Electrochemistry, 4(5), pp. 285-297.

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Abstract

The cyclic voltammetry behaviour of gold in aqueous media is often regarded in very simple terms as a combination of two distinct processes, double layer charging/discharging and monolayer oxide formation/removal. This view is questioned here on the basis of both the present results and earlier independent data by other authors. It was demonstrated in the present case that both severe cathodization or thermal pretreatment of polycrystalline gold in acid solution resulted in the appearance of substantial Faradaic responses in the double layer region. Such anamolous behaviour, as outlined recently also for other metals, is rationalized in terms of the presence of active metal atoms (which undergo premonolayer oxidation) at the electrode surface. Such behaviour, which is also assumed to correspond to that of active sites on conventional gold surfaces, is assumed to be of vital importance in electrocatalysis; in many instances the latter process is also quite marked in the double layer region.

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65 citations in Scopus
64 citations in Web of Science®
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ID Code: 64253
Item Type: Journal Article
Refereed: Yes
Keywords: Gold, Active states, Hydrous oxide, Premonolayer oxidation, Electrocatalysis
DOI: 10.1007/s100080050206
ISSN: 1433-0768
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 12 Nov 2013 05:39
Last Modified: 12 Nov 2013 05:39

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