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Kinetics of Electrocrystallization of PbO 2 on Glassy Carbon Electrodes. Influence of the Electrode Rotation
Author(s) -
GonzálezGarcía J.,
Gallud F.,
Iniesta J.,
Montiel V.,
Aldaz A.,
Lasia A.
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(200110)13:15<1258::aid-elan1258>3.0.co;2-i
Subject(s) - nucleation , glassy carbon , kinetics , electrode , crystal (programming language) , crystal growth , chemistry , rotating disk electrode , rotation (mathematics) , analytical chemistry (journal) , materials science , cyclic voltammetry , crystallography , electrochemistry , chromatography , organic chemistry , quantum mechanics , computer science , programming language , geometry , mathematics , physics
Electrodeposition of PbO 2 on glassy carbon electrodes was studied in stationary conditions and on the rotating disk electrode using chronoamperometric technique. The kinetics of electrodeposition was significantly retarded by the hydrodynamic mass transport flow. This observation is in agreement with the mechanism involving formation of soluble Pb(III) or Pb(IV) species, which may, subsequently, form PbO 2 . The kinetics of the nucleation and crystal growth was determined by the analysis of the initial part of the transients and of the whole curves. This process proceeds through the 3 dimensional progressive nucleation and crystal growth mechanism with an induction time. The growth rate constant is strongly affected by convection while the nucleation process and the induction time are much less influenced.