Palladium nucleation and growth from 0.01 M Pd(NH₃)₄Cl₂, NH₄Cl, and NH₄OH bath (pH = 10) are studied by means of cyclic voltammetry (CV), impedance spectroscopy (EIS) and electrochemical noise (EN). Crossovers in cyclic voltammograms demonstrate that the deposition of palladium proceeds via a nucleation / growth mechanism. A model based on random birth and deterministic growth of monolayers is proposed, in which the edges are assumed to follow a propagation law. The high frequency impedance data show charge transfer reaction of Pd²⁺ reduction while the low frequency features signify the growth mode of deposits. The inductive response observed in the course of polycrystalline deposition reflects the activation of electrode area while a capacitive loop appears in regular growth. Kinetic parameters of the impedance model in this system can be calculated from the fitting of experimental data to the Faradaic impedance function derived theoretically. The physical parameters of this function are analyzed by means of the dependence of simulated EIS spectra on kinetic parameters. The electrochemical noise is shown to originate from the random birth of edges and therefore the birth rate of monolayers was lower than 4.7 × 10^₁₆s^–1 cm^–2.

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