Induction time in stripping voltammetry at solid electrodes

The processes and phenomena causing the appearance of induction times in stripping voltammetry are analyzed. Induction times are observed experimentally at solid electrodes. Two such examples are presented for cathodic stripping voltammetry of phenylthiourea and methylthiourea at silver rotating disk electrodes in alkaline solutions. Induction times are inherent to the formation of deposits via the nucleation and growth mechanism, which is common in stripping voltammetry at solid electrodes. Numerical calculations of the deposition charge (which is directly related to the stripping peak current) as a function of the deposition time have been performed for the hemispherical model with progressive nucleation.