Modeling the Kinetics for the Electrolytic Oxidation of Manganese (II, III) Oxide
We are developing a finite-difference model to describe the kinetics for the electrochemical oxidation of manganese (II, III) oxide in a water splitting process. Evidence from exploratory studies using cyclic voltammetry (CV) and x-ray diffraction (XRD) suggests a reaction pathway involving diffusion and adsorption to form the desired product, manganese (III) oxide. Coupling diffusion and surface processes at the anode allows the model to determine the twelve parameters that define the kinetics of the electrochemical system. The model is consistent with experimental evidence: a fit is possible only when the model includes electron transfer with the dissolved and adsorbed electroactive species. Due to the highly non-linear equations defining the mechanism, the parameters of the fit are highly dependent on the initial guess for related values. To ensure a high level of confidence in the kinetic parameters, model outputs will be compared between concomitant techniques and with values reported in literature.
Kotfer, Daniel; Christensen, Louis; Larson, Carol; Palumbo, Robert; Nudehi, Shahin; and Schoer, Jonathan, "Modeling the Kinetics for the Electrolytic Oxidation of Manganese (II, III) Oxide" (2016). Symposium on Undergraduate Research and Creative Expression (SOURCE). 582.