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Hybrid PEDOT/MnOx nanostructured electrocatalysts for oxygen reduction

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Abstract

A series of hybrid poly(3,4-ethylenedioxythiophene)/manganese oxide (PEDOT/MnOx) thin films have been prepared via a stepwise approach: electrodeposition of PEDOT, followed by formation of MnOx particles by a spontaneous redox reaction between PEDOT and KMnO4. Electrocatalytic characterization of the PEDOT/MnOx thin films demonstrates high activity toward the oxygen reduction reaction (ORR), with a shift in intrinsic ORR onset and half-wave potentials by ca. 0.2 V to lower overpotential relative to the PEDOT thin film. The most active PEDOT/MnOx thin film electrocatalyst, P-MnOx-20, demonstrates superior activity relative to the commercial 20% Pt/C catalyst in the half-wave region of the ORR potential window at equal mass loading, with a half-wave potential of 0.83 V (20% Pt/C, 0.81 V) and charge transfer resistance of 479 Ω (20% Pt/C, 862 Ω). The P-MnOx-20 film also demonstrates preference to a pseudo-four electron ORR pathway (n = 3.8) and high specific ORR activity, when considered on both a total mass (−96 mA mgtotal−1; 20% Pt/C: −108 mA mgtotal−1) and metal (or metal oxide) mass basis (−296 mA mgMnOx−1; 20% Pt/C: −540 mA mgPt−1). The P-MnOx-20 film has been identified as the most active PEDOT/ceramic composite electrocatalyst reported to date, which is rationalized by the high surface concentration of Mn(III), strong electronic coupling between PEDOT and MnOx, as well as a high active site density and efficiency achieved by the stepwise electrodeposition-redox approach.

Graphical abstract: Hybrid PEDOT/MnOx nanostructured electrocatalysts for oxygen reduction

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Publication details

The article was received on 10 Apr 2017, accepted on 26 Apr 2017 and first published on 05 May 2017


Article type: Research Article
DOI: 10.1039/C7QM00147A
Citation: Mater. Chem. Front., 2017, Advance Article
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    Hybrid PEDOT/MnOx nanostructured electrocatalysts for oxygen reduction

    J. A. Vigil, T. N. Lambert, M. Kelly and R. Aidun, Mater. Chem. Front., 2017, Advance Article , DOI: 10.1039/C7QM00147A

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