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Assembly, electrochemical characterisation and electrocatalytic ability of multilayer films based on [Fe(bpy) 3] 2+, and the Dawson heteropolyanion, [P2W18O62]6-.

Fay, Nigel and Dempsey, Eithne and McCormac, Timothy (2005) Assembly, electrochemical characterisation and electrocatalytic ability of multilayer films based on [Fe(bpy) 3] 2+, and the Dawson heteropolyanion, [P2W18O62]6-. Journal of Electroanalytical Chemistry, 574 (1). pp. 359-366. ISSN 0022-0728

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Abstract

Successive adsorption onto a glassy carbon electrode of the Dawson heteropolyanion,[P2W18O62]6-, and the multiply charged cation [Fe(bpy)3]2+, resulted in the formation of stable multilayer assemblies on the electrode surface. Surface coverages were found to be typical of monolayer coverages for multilayer systems. Cyclic voltammetric studies of the assembly in aqueous. 0.5M NaHSO4, gave a range of redox couples associated with the Fe3+/2+ redox system, of the cationic [Fe(bpy)3]2+ moiety and the tungsten-oxo framework of the Dawson parent heteropolyanion, [P2W18O62]6-. It was possible to immobilise up to thirty monolayers, with the system exhibiting well behaved redox behaviour. The stability of the assembly towards redox switching was investigated, with it being found be extremely stable once the outer layer is anionic in nature. The immobilised film was also tested for electrocatalytic activity for the reduction of nitrite, hydrogen peroxide and bromate, and was shown to be an efficient electrocatalyst.

Item Type: Article
Uncontrolled Keywords: Dawson heteropolyanion; [Fe(bpy)3]2+; multilayer assemblies; electroctrocatalysis
Subjects: Science > Chemistry
Research Centres: Electrochemistry Research Group
Depositing User: Nicola Hanlon
Date Deposited: 15 Mar 2011 15:54
Last Modified: 11 Nov 2014 16:09
URI: http://eprints.dkit.ie/id/eprint/16

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