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The Mechanism of Mediated Electron Transfer at Redox Active Surfaces
Author(s) -
Lyons Michael E. G.
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400640
Subject(s) - redox , chemistry , electron transfer , half reaction , catalysis , reaction mechanism , kinetics , substrate (aquarium) , mass transfer , electron transport chain , chemical physics , photochemistry , inorganic chemistry , organic chemistry , chromatography , biochemistry , oceanography , geology , physics , quantum mechanics
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.