Investigating the effect of composition an‎d temperature on the synthesis an‎d improvement of electrochemical properties of nanostructured perovskite La1− xCaxFeO3

10/6/2025 12:00:00 AM

Solid oxide fuel cells are suitable electrochemical systems for converting chemical energy into electrical energy. The importance of the solid oxide fuel cell is in its ability to produce electricity with high efficiency an‎d very little pollution. For the solid oxide fuel cell, we need to develop cathodes with acceptable mechanical an‎d thermal stability of the electrode at a temperature of 600-1000 ͦ C in addition to electrical an‎d ionic conductivity, an‎d perovskites are a good option for this purpose. In this research, perovskite oxide La0.65Ca0.35Fe1-xNixO3 was used as the cathode powder, an‎d the sol-gel combustion method was used for its production. Also, gadolinium-doped ceria electrolyte was used due to its favorable physical properties, lack of electrical conductivity, an‎d good oxygen ion conductivity. Using simultaneous thermal analysis, the appropriate calcination temperature of 900 ͦ C was selec‎ted. Also, the results of X-ray diffraction analysis showed that cathodes with percentages (0 to 0.3) of nickel are single-phase an‎d have an orthorhombic structure. The field emission scanning electron microscope analysis of the surface of the cathode powder shows a heterogeneous microstructure with a little agglomeration an‎d the particle size was estimated to be about 100 nm. By Checking the Sintering temperature of symmetrical cells using electrochemical impedance spectroscopy analysis an‎d FESEM, it was concluded that 900 ͦC is the optimal temperature in terms of electrochemical performance an‎d suitable adhesion of the cathode on the electrolyte. In addition, EIS analysis was taken from all symmetrical cells at the operating temperature of 650-800 ͦC. The results showed that the optimal sample in terms of electrochemical performance is the LCFN0.1 sample with the lowest polarization resistance (2.2004 (Ω Cm2)) an‎d proper adhesion on the electrolyte.

سنتز پروسكايت , پيل سوختي اكسيد جامد , كاتد , طبف سنجي امپدانس الكتروشيميايي

perovskite synthesis , solid oxide fuel cell , cathode , electrochemical impedance spectroscopy

Sama Noori

Hossien Sarpoolaky