V. Miloš (University of Chemistry and TechnologyTechnická, Prag)
Thursday, February 25, 2021 - 14:00
Online Event
For zoom login details please contact Alexander Linke linke@wias-berlin.de, --- ---
Seminar Numerische Mathematik
A generalized Poisson-Nernst-Planck model of an yttria-stabilized zirconia (YSZ) electrolyte endowed with a lanthanum strontium manganite (LSM)--oxygen electrode interface is formulated with in the framework of non-equilibrium thermodynamics. The model takes into account limitations in oxide ion concentrations due to the limited availability of oxygen vacancies. The electrolyte model is coupled with a general reaction kinetic scheme capturing the oxygen reduction.
The model is fitted and compared to a large experimental dataset of electrochemical impedance spectra and cyclic voltammograms spanning temperatures from 700$^circ$ C to 850$^circ$ C. An apriori temperature dependenciies of the model parameters are introduced and the Nelder-Mead algorithm is employed to minimize a compound cost function. The compound cost function allows for different weights if the two types of experiments leading to interesting physical interpretations.
submitted by lawrenz (marion.lawrenz@wias-berlin.de, 030 20372566)