An Investigation and Analysis of Structural and Electrochemical Properties of Highly Ionic La2-XSrXSn2O7-ẟ Electrolyte for SOFC Applications

Authors

Fatima Melit
LIME Laboratory, University of Jijel, BP 98 Ouled Aissa, 18000, Algeria
Nedjemeddine Bounar
LIME Laboratory, University of Jijel, BP 98 Ouled Aissa, 18000, Algeria
Shabana P.S. Shaikh
Chemical Engineering Process Development Division, CSIR-National Chemical Laboratory, Pune-411008 (India)
Manish Deshpande
Department of Physics, Netaji Subhash Chandra Bose College, Nanded, India
Marlu Cesar Steil
Laboratory of Electrochemistry and Physic- chemistry of Materials and Interfaces, UMR 5279, CNRS-Grenoble INP-UJF, BP75, 38402 Saint Martin d´Hères, France

Synopsis

This study primarily focused on the investigation, synthesis and analysis of lanthanum and tin pyrochlores electrolyte for solid oxide fuel cell (SOFC) applications. Ceramic samples with diverse compositions of La2-xSrxSn2O7-δ (x = 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3) were synthesized by using a solid-state reaction (SSR) methods. The prepared La2-xSrxSn2O7-δ samples were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) measurements. The findings were interpreted in terms of formation of high oxygen vacancy and structural disorder in the La2-xSrxSn2O7-δ matrix. The doping of lanthanum (La3+) by strontium (Sr2+) had a beneficial and remarkable effect on the structural and electrical properties: the increase in the rate of Sr2+decreased the lattice parameters of the crystalline phase and enhanced the creation of oxygen vacancies, which consequently increased the ionic conductivity and decreased the activation energy. Thus, it could be understood that the studied new La2-xSrxSn2O7-δ electrolyte would be one of the potential candidates for intermediate temperature SOFC applications.

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Published
December 4, 2024