Electrochemical Impedance Spectroscopy of Alkaline Methanol Oxidation

Tanja Clees, Igor Nikitin, Lialia Nikitina, Daniela Steffes-Lai, Sabine Pott, Ulrike Krewer, Theresa Windorfer
Direct alkaline methanol fuel cell is a perspective technology for economic energy sources. The development of this technology requires advanced methods for the analysis of underlying chemical reactions. Electrochemical impedance spec-troscopy is a popular method for analysis of dynamical processes in cells by a direct measurement of linear response function of the system to harmonic perturbations. In this paper, we propose a parameter identification procedure for electrochemical impedance
more » ... ical impedance spectroscopy of alkaline methanol oxidation. The procedure is based on decomposition of the linear response function in terms of poles and zeros and cross-fit of the obtained decomposition to the kinetic model using the methods of non-linear programming. The necessary conditions of the applicability of the proposed procedure have been derived and the stability of the method has been confirmed by the numerical experiments.