Strontium-Doped BaZr0.8Ni0.2O3-δ Cobalt-Free Cathode Materials for Solid Oxide Fuel Cell


Omeiza L.A. Kabyshev A. Bekmyrza K. Kubenova M. Kuterbekov K.A. Baratova A. Adaikhan S. Bakar S.A. Azad A.K.
July 2025Korean Society for Precision Engineeing

International Journal of Precision Engineering and Manufacturing - Green Technology
2025#12Issue 41295 - 1307 pp.

Efficient cathode materials are essential to the overall cell performance of solid oxide fuel cell (SOFC). The high linear thermal expansion coefficient (TEC) of traditional cobalt-containing cathode materials, cobalt poisoning, and the expensive nature of cobalt mean that cobalt-free cathode materials must be examined. Sr-doped cobalt-free BaZr0.8Ni0.2O3-δ cathode materials were synthesised using the conventional solid-state reaction method, and investigated as potential cathode materials for SOFC application. The synthesised Ba1-xSrxZr0.8Ni0.2O3-δ (BSZN0, BSZN25, BSZN5; x = 0, 0.25 and 0.5) samples were characterized via X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, energy-dispersive X-ray spectroscopy, dilatometer, and electrochemical impedance spectroscopy. The XRD analysis of the synthesised samples revealed a well-defined peak position at 2theta, and indexed as pm-3 m cubic space group. At 800 °C, the electrical conductivity in air for BSZN0, BSZN25, and BSZN5 were 72.24 S/cm, 80.46 S/cm and 85.55 S/cm, respectively. The average linear thermal expansion coefficient obtained for BSZN0, BSZN25, and BSZN5 at 25 to 1000 °C were 10.4 × 10–6 K−1, 10. 9 × 10–6 K−1, and 11.2 × 10–6 K−1, respectively. The improved linear thermal elongation of BSZN0, BSZN25, and BSZN5 will ensure compatibility with commonly used electrolytes in SOFCs.

Composite , Electrical properties , Microstructure , Perovskites , Synthesis

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Faculty of Physics and Technical Sciences, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Faculty of Integrated Technologies, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE1410, Brunei Darussalam

Faculty of Physics and Technical Sciences
Faculty of Integrated Technologies

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