Optimization of a Novel Composite Cathode for Intermediate Temperature SOFCs Applications

Montri SUKLUENG; Voo Nyuk YOONG; Peter HING; Lim Chee MING

Authors

Montri SUKLUENG Centre for Advance Material and Energy Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE1410
Voo Nyuk YOONG Centre for Advance Material and Energy Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE1410
Peter HING Centre for Advance Material and Energy Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE1410
Lim Chee MING Centre for Advance Material and Energy Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE1410

Keywords:

Cathode, electrical conductivity, thermal expansion, crystallization, X-Ray diffraction

Abstract

Ba_0.95FeY_0.05O_2.81 was prepared by solid state reaction method to study its structure, conductivity and thermal expansion coefficients. X-ray powder diffraction at elevated temperatures showed the pure phase at 100 - 600 °C, then the phase changed at 700 - 800 °C. Electrical conductivity measurements at different temperatures showed that the conductivity increased with an increasing amount of Co₂O₃. The highest conductivity was observed for 10 wt%Ba_0.95FeY_0.05O_2.81+ 90 wt%Co₂O₃. Thermal expansion coefficients were measured for different compositions to determine the compatibility with Ce_0.9Gd_0.1O_1.95electrolyte. Results showed that the conductivity and thermal expansion coefficient were sensitive to the composition. The optimum composition was 10 wt%BFY532 + 90 wt%Co₂O₃, which gave the highest conductivity at 600 - 800°C. The thermal expansion coefficient was 12.79×10^-6^oC^-1 at 40 - 800 °C, which is compatible with the Ce_0.9Gd_0.1O_1.95 electrolyte.

doi:10.14456/WJST.2015.29

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Author Biography

Montri SUKLUENG, Centre for Advance Material and Energy Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE1410

Energy Research Group, Applied Physics Program, Faculty of Science

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