“…The study pointed to the control of the multistage Bi(III) ion electroreduction process by the reaction of formation of active complexes Bi-thiopurine on the electrode's surface, certainly localised inside the adsorption layer which mediate in the transfer of electrons (Dalmata 2005; Nosal-Wiercińska 2011a, b). The adsorption of 6TG, 6MP, AZA (Nosal-Wiercińska et al 2018a, b, 2019aKaliszczak et al 2019;Szewczuk-Karpisz et al 2020;Wiśniewska et al 2020) should be mentioned, which will not limit the electrode's surface but will favourably shift the balance of these complexes.…”