Linear sweep and cyclic voltammetry of porous mixed conducting oxygen electrode: Formal study of insertion, diffusion and chemical reaction model

The classical 1D continuum model of oxygen exchange in a porous mixed conductor (bulk path) is presented terms Linear Sweep Voltammetry (LSV) and Cyclic (CV). We show that, from formal point view, it corresponds to an insertion, diffusion chemical reaction mechanism. Some general rules for LSV/CV curves are established. Using dimensionless description, we evidence eight different limiting behaviors the electrochemical model, which depend on four parameters. For almost full insertion level at equilibrium, these parameters can be reduced only two, i.e. electrode thickness L rate constant λ. that resulting zone diagram, plotted using representation log versus λ, useful predict possible sequences as function potential sweep thickness. This theoretical analysis applied LSCF under air high temperature.