An Investigation and Analysis of Structural and Electrochemical Properties of Highly Ionic La2-XSrXSn2O7-ẟ Electrolyte for SOFC Applications
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.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.