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Electrocatalytic properties of the polypyrrole/magnetite hybrid modified electrode towards the reduction of hydrogen peroxide in the presence of dissolved oxygen
University of Szeged, Hungary.ORCID iD: 0000-0003-3237-9222
2012 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 73, p. 53-58Article in journal (Refereed) Published
Abstract [en]

In this study, we report on the electrocatalytic behaviour of a polypyrrole/magnetite hybrid electrode towards the reduction of hydrogen peroxide. The electrocatalytic activity of the composite electrode was demonstrated by cyclic voltammetric and chrono-amperometric measurements in comparison with the identically prepared neat polymer film. The stationary reduction currents, measured at an appropriately chosen potential (here at E = -0.3 V), plotted against the peroxide concentration gave a perfect linear correlation in nitrogen atmosphere in the micromolar concentration range. The performance of the composite electrode was not affected by the presence of sulphate, nitrate or chloride anions. In the presence of dissolved oxygen a complex electrocatalytic activity was observed, involving the reduction of both oxygen and H2O2. However, a linear dependence was found also in oxygen containing media, although with much higher currents, but with the same slope (even at different oxygen concentrations). This fact may trigger the development of such hybrid electrodes towards hydrogen peroxide sensors in different aqueous (including natural) samples.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 73, p. 53-58
Keywords [en]
Hybrid electrode, Magnetite, Polypyrrole, H2O2 detection, O-2 reduction
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-218763DOI: 10.1016/j.electacta.2011.10.100ISI: 000305261100009Scopus ID: 2-s2.0-84861341840OAI: oai:DiVA.org:kth-218763DiVA, id: diva2:1161454
Note

QC 20171130

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-11-30Bibliographically approved

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