Development of cobalt-free oxide (Sm0.5Sr0.5Fe0.8Cr0.2O3-δ) cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs)

Iwan Susanto, Dianta Mustofa Kamal, Sidiq Ruswanto, Rahmat Subarkah, Fuad Zainuri, Sulaksana Permana, Johny Wahyuadi Soedarsono, Adi Subardi, Yen Pei Fu

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1 Citation (Scopus)

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

Original languageEnglish
Pages (from-to)15-20
Number of pages6
JournalEastern-European Journal of Enterprise Technologies
Volume6
Issue number5-108
DOIs
Publication statusPublished - 2020

Keywords

  • cobalt-free cathode
  • conductivity
  • oxygen content
  • perovskite structure
  • solid oxide fuel cells

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