Electrochemical characterization of the Sr0.66(La0.33)Mn0.66(Cr0.33)O3+/-z ceramic candidate for solid oxide fuel cell anode

G. M. E SILVA; M. C. DE A. FANTINI; C. F. M. SETEVICH; L. M. TOSCANI; D. G. LAMAS; S. A. LARRONDO

Buenos Aires

Congreso; VIII Symposium on Hydrogen, Fuel Cells and Advanced Batteries - HYCELTEC 2022; 2022

The solid oxide fuel cell (SOFC) is an electrochemical device that supplies electrical energy. It stands out for having high efficiency in energy conversion. In this context, many studies have been developed looking for better materials for SOFC anode. Ceramic materials with perovskite structure based on Sr-doped lanthanum chromite manganite have shown promising results. For example, La0.75Sr0.25Cr0.5Mn0.5O3-σ. So, having that material as base and that the high content of Sr2+ and the cationic deficiency at site A aim to increase the electronic conduction. Whereas high content of Mn and the cation deficiency at site B aims to increase ionic conduction. Thus, the ceramic investigated here is the new composition Sr0.66La0.33Mn0.66Cr0.66O3+/-Z (33LSCM33).In addition to the reasons already mentioned, this investigation is also justified by the original choice of the synthesis method used in this work. The material is synthesized using the micellar sol-gel method with structure directing and swelling agents. This method is wellknown to be used to produce porous morphology, which is an essential characteristic for an anode material.Furthermore, electrode fixation strategies are used for improvement the cells, as: sanding of green electrolyte, elevation of electrode fixation temperature (Tf) and use of ZrO2–8%mol Y2O3 (YSZ) porous layer between electrode and electrolyte. Considering that these strategies should increasethe contact area between electrolyte and electrode.Therefore, this study has as its aims the synthesis of the material by a method never used to produce LaxSr1-xCryMn1- yO3-σ type-materials and the production of a one with new composition, 33LSCM33. Moreover, the evaluation of electrode fixation improvement strategies and, mainly, the characterization (by electrochemical impedance spectroscopy, EIS) of the 33LSCM33 ceramic for possible implementation as SOFC anode material.