The reduction of oxygen on iron(II) oxide/poly(3,4-ethylenedioxythiophene) composite thin film electrodes

Kerr, Robert, Pozo-Gonzalo, Cristina, Forsyth, Maria and Winther-Jensen, Bjorn 2015, The reduction of oxygen on iron(II) oxide/poly(3,4-ethylenedioxythiophene) composite thin film electrodes, Electrochimica acta, vol. 154, pp. 142-148, doi: 10.1016/j.electacta.2014.12.048.

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Title The reduction of oxygen on iron(II) oxide/poly(3,4-ethylenedioxythiophene) composite thin film electrodes
Author(s) Kerr, RobertORCID iD for Kerr, Robert
Pozo-Gonzalo, CristinaORCID iD for Pozo-Gonzalo, Cristina
Forsyth, MariaORCID iD for Forsyth, Maria
Winther-Jensen, Bjorn
Journal name Electrochimica acta
Volume number 154
Start page 142
End page 148
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-02-01
ISSN 0013-4686
Keyword(s) Science & Technology
Physical Sciences
Summary © 2014 Elsevier Ltd. All rights reserved. Conducting polymers (CPs) are currently being investigated for use in many applications owing to their abilities to catalyze a wide range of electrochemical reactions and act as an effective electrode support for various inorganic and organic electrocatalyst materials. Here, we have found that the deposition of poly(3,4-ethylenedioxythiophene) (PEDOT) through the use of an established base-inhibited chemical vapor-phase polymerization (VPP) procedure using an iron(III) tosylate oxidant results in the co-deposition of electrocatalytic iron(II) oxide species within the film. The presence of these species accounts for the 2-electron reduction of hydrogen peroxide that occurs on these electrodes during the series 4-electron oxygen reduction reaction. Furthermore, this realization leads to the possibility of fabricating thin film inorganic/CP composites of various compositions through careful choice of oxidant in a facile, one-step process. A combination of in situ Raman (487.77 nm laser) and in situ UV-Vis spectroscopy was used to probe the oxidation state of PEDOT in the thin film composite electrodes while reducing oxygen in alkaline conditions. These measurements show that the 2-electron electroreduction of hydrogen peroxide (or HO2 -) occurs only on the iron(II) oxide species in a reaction that is facilitated by an effective electron transfer from the delocalized electron orbitals of the PEDOT matrix. This approach could potentially be used in situ to monitor the electrocatalyst/electrode interface quality of conducting polymer-supported electrocatalysts.
Language eng
DOI 10.1016/j.electacta.2014.12.048
Field of Research 030102 Electroanalytical Chemistry
03 Chemical Sciences
09 Engineering
02 Physical Sciences
Socio Economic Objective 850602 Energy Storage (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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Document type: Journal Article
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