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Surface Catalytic Mechanism in Square‐Wave Voltammetry
Author(s) -
Mirčeski Valentin,
Gulaboski Rubin
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200111)13:16<1326::aid-elan1326>3.0.co;2-s
Subject(s) - azobenzene , reaction rate constant , hydrogen peroxide , catalysis , redox , chemistry , cyclic voltammetry , voltammetry , electron transfer , electrochemistry , square wave , reaction mechanism , analytical chemistry (journal) , electrode , inorganic chemistry , kinetics , organic chemistry , molecule , physics , quantum mechanics , voltage
A pseudo‐first‐order catalytic mechanism in which both reactant and product of the redox reaction are strongly immobilized on the electrode surface is theoretically analyzed under conditions of square‐wave voltammetry (SWV). A mathematical procedure is developed for diffusionless conditions. The relationships between the properties of the voltammetric response and both the kinetic parameters of the redox reaction and the parameters of the excitement signal are studied. The phenomenon of the quasireversible maximum is discussed. The theoretical results are confirmed with the experiments of azobenzene performed in a presence of hydrogen peroxide. In acetate buffer with pH 4.2 the standard rate constant of charge transfer of azobenzene is k s = 12 s −1 and the catalytic rate constant in the presence of hydrogen peroxide is k c = 2.24×10 4 s −1 mol −1 L.