%0 Generic
%A Vogler, Marcel
%D 2009
%F heidok:9532
%K Direktflammen-Brennstoffzelle , DFFC , Einkammer-Brennstoffzelle , modellbasierte Interpretationdirect-flame fuel cell , DFFC , model based experiment interpretation
%R 10.11588/heidok.00009532
%T Elementary kinetic modelling applied to solid oxide fuel cell pattern anodes and a direct flame fuel cell system
%U https://archiv.ub.uni-heidelberg.de/volltextserver/9532/
%X In the course of this thesis a model for the prediction of polarisation characteristics of solid oxide fuel cells (SOFC) was developed. The model is based on an elementary kinetic description of electrochemical reactions and the fundamental conservation principles of mass and energy. The model allows to predict the current-voltage relation of an SOFC and offers ideal possibilities for model validation. The aim of this thesis is the identification of rate-limiting processes and the determination of the elementary pathway during charge transfer. The numerical simulation of experiments with model anodes allowed to identify a hydrogen transfer to be the most probable charge-transfer reaction and revealed the influence of diffusive transport. Applying the hydrogen oxidation kinetics to the direct flame fuel cell system (DFFC) showed that electrochemical oxidation of CO is possible based on the same mechanism. Based on the quantification of loss processes in the DFFC system, improvements on cell design, predicting 80% increase of efficiency, were proposed.