Combined voltammetry and potentiostatic current transient techniques have been employed to study the electroreduction processes of anodically formed lead sulphate layers on polycrystalline lead electrodes in concentrated sulphuric acid solutions in the 0-50 degrees C temperature range. Data analysis using parametric identification procedures and nonlinear fit routines has demonstrated that the kinetics of the electroreduction processes of the Pb(II)-containing surface species can be interpreted in terms of complex nucleation and growth mechanisms. The electroreduction of the PbSO4 layer involves mainly an instantaneous nucleation and 3D growth mechanism under diffusion control. The activation energy of the different reaction stages can be calculated from Arrhenius plots derived from the corresponding kinetic parameters. This contributes to a better understanding of the whole cathodic reaction scheme as well. as to the identification and characterization of the various stages taking place in the electroreduction processes.