Nanoporous Platinum Electrodes as Substrates for Metal Oxide-Supported Noble Metal Electrocatalytic Nanoparticles: Synergistic Effects During Electrooxidation of Ethanol

Iwona A. Rutkowska; Margaretta D. Koster; Gary J. Blanchard; Pawel J. Kulesza

doi:10.1071/CH14264

RESEARCH FRONT

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Nanoporous Platinum Electrodes as Substrates for Metal Oxide-Supported Noble Metal Electrocatalytic Nanoparticles: Synergistic Effects During Electrooxidation of Ethanol

Iwona A. Rutkowska ^A ^C , Margaretta D. Koster ^B , Gary J. Blanchard ^B and Pawel J. Kulesza ^A

+ Author Affiliations

- Author Affiliations

^A Department of Chemistry, University of Warsaw, Pasteura 1, PL-02-093 Warsaw, Poland.

^B Department of Chemistry, Michigan State University, East Lansing, MI 48824-1322, USA.

^C Corresponding author. Email: ilinek@chem.uw.edu.pl

Australian Journal of Chemistry 67(10) 1414-1421 https://doi.org/10.1071/CH14264
Submitted: 27 April 2014 Accepted: 2 June 2014 Published: 14 July 2014

Abstract

Electrocatalytic oxidation of ethanol in acid medium (0.5 mol dm^–3 H₂SO₄) was significantly enhanced by not only supporting bimetallic PtRu nanoparticles on nanostructured metal oxides (TiO₂ or WO₃), but also by depositing such catalytic systems on planar nanoporous platinized electrode substrates. Incorporation of TiO₂ or WO₃ into the electrocatalytic interface was likely to improve proton mobility and to provide –OH groups capable of inducing the removal of poisoning species, such as CO, from the Pt sites in the bimetallic PtRu catalyst. Synergistic interactions between ruthenium and titania were also possible. Regularly porous nanostructured platinum substrate also permitted development of submicro ‘reactors’ where reactant molecules, electrolyte ions, and all active components (TiO₂ or WO₃, Pt substrate, PtRu catalytic sites) could co-exist and become easily accessible. While WO₃ was able to undergo fast reversible redox transitions to non-stoichiometric oxides, efficient utilization of inert (non-electroactive) TiO₂ required admixing with carbon nanotubes to ensure easy charge distribution and good conductivity at the electrocatalytic interface.

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Nanoporous Platinum Electrodes as Substrates for Metal Oxide-Supported Noble Metal Electrocatalytic Nanoparticles: Synergistic Effects During Electrooxidation of Ethanol

Abstract

References

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