Synthesis and electrochemical characterization of La0.75Sr0.25Mn0.5Cr0.5−xAlxO3, for IT‐ and HT‐SOFCs

• Published in: International journal of applied ceramic technology Vol. 17; no. 3; pp. 1276 - 1285
• Main Authors: Abdalla, Abdalla M., Kamel, Madeha, Hossain, Shahzad, Irvine, John T. S., Azad, Abul K.
• Format: Journal Article
• Language: English
• Published: Malden Wiley Subscription Services, Inc 01-05-2020
• Subjects: AC conductivity; Anodes; binding energy; Crystallization; Doping; electrical conductivity; Electrochemical analysis; Electrode materials; perovskite; Perovskites; Solid oxide fuel cells; Solid phases; Surface properties; XPS
• ISSN: 1546-542X; 1744-7402
• DOI: 10.1111/ijac.13375

The main emphasis of this work is to create a new perovskite material with three different compositions (La0.75Sr0.25Mn0.5Cr0.5−xAlxO3, x = 0.1, 0.2, 0.3) applied in both Intermediate‐ and High‐temperature Solid Oxide Fuel Cells (IT‐ and HT‐SOFCs). Perovskite‐type polycrystalline La0.75Sr0.25Mn0.5Cr0.5−xAlxO3−δ (x = 0.1, 0.2, 0.3) powders were synthesized and formed in a single phase structure by a dry chemistry route (standard solid‐state reaction method). The effect of Al doping on physicochemical and surface properties has been discovered. The compounds were crystallized in single phase rhombohedral symmetry (R‐3C Space. Group). Total conductivity of Al doping in wet 5% H2 was higher than both dry 5% H2 and air. The obtained results enhance the electro‐catalytic performance and the material conductivity as well, which will be good for anode materials in IT‐ and HT‐SOFCs and the optimum doping is 10%.
XRD with inserted 3D structure presentation of the LSCMA (left). XPS wide spectra of La0.75Sr0.25Mn0.5Cr1−xAlxO3−δ (x = 0.1, 0.2, 0.3) oxide in air and H2 (right).