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Characterization and electrocatalytic application of silver modified polypyrrole electrodes

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Author(s): V. M. JOVANOVIC | S. TERZIC | A. DEKANSKI

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 70;
Issue: 1;
Start page: 41;
Date: 2005;
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Keywords: polypyrrole | modification by immersion in AgNO3 | AES and XPS techniques | electrooxidation of formaldehyde

ABSTRACT
Silver modified polypyrrole electrodeswere preparedwith the aim of testing them for the electrooxidation of formaldehyde in alkaline solution. The modification of polypyrrole by immersion in aqueous AgNO3 solution was studied by cyclic voltammetry and vacuum techniques (AES and XPS). The influence of time of immersion and the thickness of the polypyrrole film, prepared by electrochemical polymerization, on the modification of the polymer were examined. The results acquired from both electrochemical and spectroscopic examinations show that immersion of a polypyrrole electrode in a AgNO3 solution results in its modificationwith silver, which is deposited in the elemental state on the surface. The quantity of silver deposited depends not only on the immersion time but also on the thickness of the polymer film. A modified PPy/Ag electrode exhibits catalytic activity for the electrooxidation of CH2O in NaOH. In spite of the low quantity of silver, the activity of the electrode for this reaction is comparable to that of a polycrystalline silver electrode.

Tango Jona
Tangokurs Rapperswil-Jona

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