Active site model for CO adlayer electrooxidation on nanoparticle catalysts

  1. Get@NRC: Active site model for CO adlayer electrooxidation on nanoparticle catalysts (Opens in a new window)
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Journal titleJournal of Electroanalytical Chemistry
Pages121132; # of pages: 12
SubjectCarbon monoxide oxidation; Nanoparticle electrocatalysis; Kinetic modeling; Kinetic Monte Carlo simulations
AbstractWe present a two-state model for CO electrooxidation on catalyst nanoparticles. It exploits the active site concepts in order to describe the effects of the heterogeneous surface structure on the catalytic activity of nanoparticle systems. In this approach, the apparent reactivity results from the interplay between kinetic processes that occur on active sites and surface transport of adsorbed reactants from inactive towards active sites. It is demonstrated that this model is a generalization of well-known mean field (MF) and nucleation and growth models. Kinetic Monte Carlo (kMC) simulations specifically developed for this problem were employed for establishing the relevance of the different model parameters for the shape of chronoamperometric and linear sweep current transients. In the limit of fast COad surface mobility, the corresponding MF approximation with active sites and its analytical solutions for limiting cases are presented. The comparison of the general kMC solution with the MF approximation reveals major applicability limits of the MF approach for heterogeneous surface models. Although the current work concentrates on the specific case of COad adlayer electrooxidation, the model is readily applicable for other reactions where surface heterogeneity is likely to play an important role.
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AffiliationNational Research Council Canada; NRC Institute for Fuel Cell Innovation
Peer reviewedNo
NPARC number9724246
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Record identifier59682d20-739a-453a-9c82-9126c993f30e
Record created2009-07-17
Record modified2016-05-09
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