Abstract
The nano ceramic Ba0.5Sr0.5Co0.2Fe0.8O3 (BSCF) powders have been synthesized by Sol-Gel process using nitrate based chemicals for SOFC applications since these powders are considered to be more promising cathode materials for SOFC. Glycine was used as a chelant agent and ethylene glycol as a dispersant. The powders were calcined at 850℃/3 hr in the air using Thermolyne 47,900 furnace. These powders were characterized by employing SEM/EDS, XRD and TGA/DTA techniques. The SEM images BSCF powder indicate the presence of highly porous spherical particles with nano sizes. The XRD results shows the formation of BSCF perovskite phase at the calcination temperature of 850℃. From XRD line broadening technique, the average crystllite size of the BSCF powders were found to be around 9.15 - 11.83 nm and 13.63 - 17.47 nm for as prepared and after calcination at 850℃ respectively. The TGA plot shows that there is no weight loss after the temperature around 450℃ indicating completion of combustion.
Highlights
Solid oxide fuel cells (SOFCs) are considered as one of the most promising energy conversion devices that exhibit advantages such as high efficiency, system compactness and low environmental pollution [1,2,3,4]
The nano ceramic Ba0.5Sr0.5Co0.2Fe0.8O3 (BSCF) powders have been synthesized by Sol-Gel process using nitrate based chemicals for SOFC applications since these powders are considered to be more promising cathode materials for SOFC
Since SOFC operate at very high temperatures ~1000 ̊C, it removes the need for precious metal-catalyst, thereby reducing cost
Summary
Solid oxide fuel cells (SOFCs) are considered as one of the most promising energy conversion devices that exhibit advantages such as high efficiency, system compactness and low environmental pollution [1,2,3,4]. Park et al [12] studied zinc-doped barium strontium cobalt ferrite (Ba0.5Sr0.5Co0.2–xZnxFe0.8O3–δ(BSCZF), x = 0, 0.05, 0.1, 0.15, 0.2) perovskite oxide powders for cathodes of SOFCs application using the eyhylene diamine tetraacetic acid (EDTA)-citrate method with repeated ball-milling and calcining They were evaluated as cathode materials for SOFC at intermediate temperature (ITSOFCs) using XRD, H2-TPR, SEM and electrochemical tests. These methods are time consuming and require high temperature calcination (>950 ̊C) and long time to prepare the precursor, which faces the difficulties in preparing homogenous material with good reproducibility To overcome such difficulties a sol-gel process is used generally for preparing the pure BSCF nano-powder for SOFC cathode application. While the physical characterization of the powders were carried out using SEM/EDS, XRD techniques, the thermal properties were carried out using TGA/DTA techniques
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