Application of current reversal chronopotentiometry and cyclic chronopotentiometry to the study of reactant and/or product adsorption at a plane electrode

A general, analytical solution applying current reversal chronopotentiometr y and cyclic chronopotentiometry to a reversible charge transfer process wi th reactant adsorption obeying Henry's law is presented. We compare the abo ve results with those deduced when both reactants are strongly adsorbed and either Langmuir's or Henry's isotherm is obeyed. We have considered in thi s last case that the successive applied currents are programmed alternating currents of the form I(t(j)) = (-1)(/+1)I(j)t(j)(omega). Criteria for dist inguishing between the adsorption of the reactant, the product or both simu ltaneously and methods for determining adsorption parameters are proposed. (C) 1998 Elsevier Science Ltd. All rights reserved.