Coulometric studies in the Department of Chemistry of the University of Warsaw

The coulometric studies carried out in the Department of Chemistry of the University of Warsaw have been described. In the first part of this brief review there were discussed papers in which coulometric titration was used as a main method of the study. In this section the achievements of Stanisław Głąb and his coworkers in that field were shortly described and discussed. Both the use of the coulometric titration in elaboration of a new analytical titration methods and its application to the determination of equilibrium constants of several reactions have been presented. In the second part, the results obtained with the use of two variants of constant potential coulometry were presented. In the first classical variant, the thickness of the solution layer (d), from which occurs the diffusion to the electrode was much larger than the diffusion layer thickness (δ), d » δ. In the second variant inequality d « δ is obeyed. The later case relates to the so-called thin-layer chronocoulometry, when the reactive layer (solution or film on the electrode) is very thin. Some papers published by the researchers from the Chemistry Department of the University of Warsaw were presented, especially those where thin layers of heavy metal (as iron, nickel, cobalt and others) hexacyanoferrates such as for instance Prussian Blue, were deposited either on platinum, gold, glassy carbon electrodes or on carbon nanotubes. The transport of charge in such layers was briefly discussed. In the last part, the application of so-called voltochronocoulometry by researchers of the Chemistry Department of the University of Warsaw to the study of different electrode reactions and double layer phenomena is presented