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An in situ electrochemical quartz crystal microbalance study of polycrystalline gold electrodes in nitric acid solution

Shackleford, Steven G. D. and Boxall, C and Port, Simon N. and Taylor, Robin J. (2002) An in situ electrochemical quartz crystal microbalance study of polycrystalline gold electrodes in nitric acid solution. Journal of Electroanalytical Chemistry, 538-53. pp. 109-119. ISSN 0022-0728

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Abstract

The dissolution and redeposition processes of Au in HNO3 solution at pH 1 and 0 were investigated as a function of sweep rate by in situ EQCM experiments. The results demonstrate that, at pH 1 and vless than or equal to10 mV s(-1), An dissolves through a 3 e(-) oxidation at E > +1.0 V versus saturated calomel electrode (SCE), a process that, at vgreater than or equal to10 mV s(-1), is kinetically hindered with respect to upd of OH surface sublattices and subsequent 2-D-phase oxide formation. The inhibition arises from the presence of a close packed layer of nitrate oxyanions at the gold surface, although the layer is disrupted and the inhibition removed by the Au dissolution and reprecipitation processes that occur during potential cycling at low v. (C) 2002 Elsevier Science B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Journal of Electroanalytical Chemistry
Uncontrolled Keywords: EQCM ; gold dissolution ; gold oxdation ; gold-nitrate system ; SCANNING-TUNNELING-MICROSCOPY ; ELECTROCATALYTIC BEHAVIOR ; CYCLIC VOLTAMMETRY ; SULFURIC-ACID ; OXIDE-FILMS ; ANODIC BEHAVIOR ; PERCHLORIC-ACID ; DOUBLE-LAYER ; IN-SITU ; MONOLAYER THICKNESS
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Engineering
ID Code: 52703
Deposited By: ep_importer_pure
Deposited On: 05 Mar 2012 11:23
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:07
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52703

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