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Issue 18, 2009
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Electrochemical reduction of oxygen on nanoparticulate gold electrodeposited on a molecular template

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Abstract

The reduction of oxygen on gold electrodeposited on an organic template has been investigated. The template consisted of reduced 4-nitrophenyl groups attached to glassy carbon (GC) by the electrochemical reduction of the corresponding diazonium compound. The electrode modified by this Au nanostructured film shows electrocatalytic properties for the oxygen reduction reaction (ORR) different from those of bulk Au, GC or GC grafted with 4-nitrophenyl groups. The reduced nitrophenyl film inhibits the O2 reduction reaction. A two-step reduction mechanism with production of hydrogen peroxide in the first step and water in the second was observed in alkaline solutions. The standard heterogeneous rate constants for this two-electron transfer sequential reaction (EE reduction mechanism) have been calculated using non-linear regression analysis (NLR).

Graphical abstract: Electrochemical reduction of oxygen on nanoparticulate gold electrodeposited on a molecular template

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Article information


Submitted
22 Oct 2008
Accepted
26 Jan 2009
First published
02 Mar 2009

Phys. Chem. Chem. Phys., 2009,11, 3463-3471
Article type
Paper

Electrochemical reduction of oxygen on nanoparticulate gold electrodeposited on a molecular template

F. Mirkhalaf, K. Tammeveski and D. J. Schiffrin, Phys. Chem. Chem. Phys., 2009, 11, 3463
DOI: 10.1039/B818439A

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