Patten, Hollie V., Ventosa, Edgar, Colina, Alvaro, Ruiz, V. (Virginia), López-Palacios, Jesús, Wain, Andrew J., Lai, Stanley C. S., Macpherson, Julie V. and Unwin, Patrick R.. (2011) Influence of ultrathin poly-(3,4-ethylenedioxythiophene) (PEDOT) film supports on the electrodeposition and electrocatalytic activity of discrete platinum nanoparticles. Journal of Solid State Electrochemisty, Vol.15 (No.11-12). pp. 2331-2339. ISSN 1432-8488

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Abstract

Coating a carbon electrode surface, specifically highly oriented pyrolytic graphite (HOPG) with an ultrathin film of poly-(3,4-ethylenedioxythiophene), PEDOT, provides a support on which a high density of uniformly dispersed Pt nanoparticles (NPs) can readily be formed by electrodeposition. The NPs tend to be much smaller, have a higher surface coverage, better dispersion and show a much lower tendency to aggregate, than Pt NPs produced under identical electrochemical conditions on HOPG alone. The electrocatalytic activity of the NPs was investigated for methanol (MeOH) and formic acid (HCOOH) oxidation. Significantly, for similarly prepared particles, Pt NP-PEDOT arrays exhibited higher catalytic activity (in terms of current density, based on the Pt area), towards MeOH oxidation, by an order of magnitude, and towards HCOOH oxidation at high potentials, than Pt NPs supported on native HOPG. These findings can be rationalised in terms of the enhanced oxidation of adsorbed CO, a key reaction intermediate and a catalyst poison. This research provides strong evidence that employing conducting polymers, such as PEDOT, as a support substrate, can greatly improve particular catalytic reactions, allowing for better catalyst utilisation in fuel cell technology.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Electrocatalysis, Formic acid -- Oxidation, Methanol -- Oxidation, Thin films, Nanoparticles
Journal or Publication Title:	Journal of Solid State Electrochemisty
Publisher:	Springer
ISSN:	1432-8488
Date:	December 2011
Volume:	Vol.15
Number:	No.11-12
Page Range:	pp. 2331-2339
Identification Number:	10.1007/s10008-011-1446-0
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), National Physical Laboratory (Great Britain) (NPL), Spain. Ministerio de Ciencia e Innovación (MCINN), Castilla y León (Spain). Junta (JCYL), Suomen Akatemia [Academy of Finland]
Grant number:	EP/H0239091 (EPSRC), CTO2010-17127 (MCINN), GR-71/BU006A09 (JCYL)
URI:	http://wrap.warwick.ac.uk/id/eprint/39061

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