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Quantifying metal support interaction in ceria-supported Pt, PtSn and Ru nanoparticles using electrochemical technique

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.jcat.2015.10.015
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Name affiliation
  1. National Research Council of Canada. Energy, Mining and Environment
FormatText, Article
SubjectCerium compounds; Ethylene; Interfaces (materials); Metal nanoparticles; Metals; Nanoparticles; Platinum; Polarization; Electrochemical promotion; Electrochemical techniques; Ethylene oxidation; Exchange current densities; Faradaic efficiencies; Metal-support interactions; Polarization curves; Polarization measurements; Ruthenium
Abstract
Electrochemical promotion and metal-support interaction (MSI) have long been viewed as two separate phenomena; however, more recently it has been shown that, functionally, for ionic and mixed ionic-electronic conducting materials, both are linked by the transfer of ionic species at the interfaces. The purpose of this study was to exhibit a relationship between these two concepts through the use of an electrochemical technique to evaluate CeO2-supported Pt- and Ru-based nanoparticles. The presence of ceria was found to increase the reaction rate when compared to free-standing Pt and Ru nanoparticles with the metal-support interaction rate enhancement ratios, ρMSI, up to 14. Polarization measurements established that higher exchange current density, i0, values correspond to lower open circuit catalytic rates. An apparent self-induced Faradaic efficiency was proposed and determined for each catalyst; lowest value (|ΛMSI| =1053) corresponded to 1 wt% Pt-1/CeO2.
Publication date
In
  • Journal of Catalysis 333 (18 November 2015): 40–50.
LanguageEnglish
Peer reviewedYes
NPARC number21277458
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Record identifiere31c5343-4a13-4713-8f1f-8766643e2eba
Record created2016-03-09
Record modified2020-04-22
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