A Coupled Experimental/Numerical Approach for Tuning High-Performing SOFC-Cathode
Résumé
In this paper, a coupled experimental and numerical approach is used to assess the influence of electrode micro/nano-structure and composition on electrochemical performance. First, the area-specific resistance (ASRchem) of 100 vol. % La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) and 60:40 vol. %LSCF:CGO (Ce0.9Gd0.1O2-δ) composite cathode operating at intermediate temperature range (550-650 ˚C) was investigated by impedance spectroscopy. Despite positive expectations based on the literature, the composite in this work showed ASRchem values almost twice as high as those of the pure LSCF cathode. It is believed that the beneficial effect of the addition of CGO on the bulk transport is lost by a drastic reduction of the specific surface area. Next, a 3D finite element method (FEM) cube model is implemented to study the influence of the CGO addition and to relate microstructural modifications to the ASRchem. The model successfully calculates the performance of randomly-distributed constituent phases.
Domaines
Matériaux
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