A codeposition of bismuth and lead from Bi3+/Bi2+/Bi+/Bi-0 and Pb2+/Pb+/Pb-0 systems in 0.5 M KNO3 (pH = 1) was investigated by cyclic voltammetry technique. The process was recognized as electrocatalytic and depicted by the two-plate model including Brunauer, Emmett and Teller (BET) adsorption expression.The model recreates all of the not resolved responses of two electronation/deelectronation couples. An alteration of electrode surface throughout electrode reaction is integrated with the model. It was proved that cyclic voltammetry (CV) method and two-plate approach is adequate to achieve a complete depiction of considered codeposition process. The estimated values of electrochemical kinetic parameters as well as the two-plate model with its BET adsorption expression were validated and discussed. (C) 2016 Elsevier B.V. All Tights reserved.