Kinetics of electrocrystallization of PbO2 on glassy carbon electrodes. Influence of the electrode rotation

Electrodeposition of PbO2 on glassy carbon electrodes was studied in statio nary 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 wit h the mechanism involving formation of soluble Pb(III) or Pb(IV) species, w hich may, subsequently, form PbO2. The kinetics of the nucleation and cryst al growth was determined by the analysis of the initial part of the transie nts and of the whole curves. This process proceeds through the 3 dimensiona l progressive nucleation and crystal growth mechanism with an induction tim e. The growth rate constant is strongly affected by convection while the nu cleation process and the induction time are much less influenced.