The Mechanism of Mediated Electron Transfer at Redox Active Surfaces

Theoretical models describing transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at RDE surfaces modified with catalytically active layers are presented. Model A regards the interaction between the surface immobilized redox active mediator and subst...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2015-04, Vol.27 (4), p.992-1009
Main Author: Lyons, Michael E. G.
Format: Article
Language:English
Subjects:
Catalysis
Chemically modified electrodes
Electrodes
Electron transfer
Flux
Heterogeneous redox catalysis
Mathematical models
Mediated electron transfer
Reaction kinetics
Reaction/diffusion equations
Rotating disc electrodes
Surface chemistry
Transport
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Summary:Theoretical models describing transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at RDE surfaces modified with catalytically active layers are presented. Model A regards the interaction between the surface immobilized redox active mediator and substrate being described in terms of bimolecular reaction kinetics. Model B assumes the interaction involves the formation of an adduct. Both consider the processes of heterogeneous electron transfer between immobilized mediator and support electrode, chemical reaction between redox mediator/reactant, and reactant diffusive mass transport, and expressions for the net reaction flux are derived. Kinetic case diagrams are constructed.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.201400640