Abstract
A cobalt-free perovskite oxide Sm0.5Sr0.5Fe0.8Cr0.2O3-δ (SSFC) has been exploited as a novel cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The cathode model was synthesized with the addition of the chromium element in the B side of the composite metallic oxide system, which was then formed by the solid-state reaction method. The model system was further characterized in detail for getting the properties behavior. The solid-state reaction of the SSFC system was observed through thermal gravimetric analysis. Meanwhile, the structural properties were investigated by x-ray diffraction, and the weight loss was examined by the thermal gravimetric analysis as well. Furthermore, the thermal expansion coefficient was determined by the thermal-mechanical analysis, and the conductivity properties were tested by the thermal conductivity analysis. The result showed that the SSFC cathode demonstrated the crystalline structure based on the design with a perovskite phase. The oxygen content created on the model structure was obtained to be 2.98 after the calcination process. The average thermal expansion coefficient was achieved up to 5.0×10-6 K-1 as the heating given up to 800 °С. Moreover, the conductivity value reached from 2 S∙cm-1 at 400 °С and it increased to be a maximum of 7.5 S∙cm-1 at 700 °С. In addition, the presence of Cr6+ cation valence coordinated with the oxygen anion could lead to generating a large concentration of oxygen vacancies on the cathode surface, facilitating the transport of the O2− anion in the cathode system. Based on these results, the SSFC cathode has good properties as a composite system promising for IT-SOFCs application in the future
Highlights
Intermediate-temperature solid oxide fuel cells (SOFCs) (IT-SOFCs) have attracted a great deal of attention as potential power generators due to the high efficiency, low environmental impact, and fuel versatility [1,2,3]
As in practice for a long-term application, these Co-based mixed ionic and electronic conductors (MIEC) have low stability influenced by the difference of high thermal expansion with an electrolyte, which has challenged to develop the cathode for IT-SOFCs
In this work, we schematically investigated the structure and properties of the cobalt-free cathode based on the composite materials of Sm, Sr, Fe, and Cr for potential application in IT-SOFCs
Summary
Intermediate-temperature SOFCs (IT-SOFCs) have attracted a great deal of attention as potential power generators due to the high efficiency, low environmental impact, and fuel versatility [1,2,3]. Among perovskite-type oxides noted as ABO3-δ, mixed ionic and electronic conductors (MIEC) have been widely used in IT-SOFCs [4,5,6,7,8] They are good materials for important applications, including as electro-catalysts for solid oxide fuel cells (SOFCs), in oxygen-permeable membranes, and in oxygen absorbers. A comprehensive study is needed to find out a novel cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs) to overcome the various limitations above. The use of another material, including the chromium element as the metal transition for the cathode system could be a smart strategy to the development of the IT-SOFCs system [16]. The development of IT-SOFCs has made it preferable to use metallic interconnects (MICs) to reduce the cost and significantly increase efficiency
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