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Published on: February 27, 2017
Structures and Properties of LaFe0.8Cu0.2O3- and BaFe0.8Cu0.2O3- as Cobalt-Free Perovskite-Type Cathode Materials for
Asim Idrees1, Xuening Jiang1, Gang Liu1
1Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education) School of Physics Dalian University of Technology No. 2 Linggong Road Ganjingzi District Dalian 116024 P. R. China.
Abstract:
Perovskite oxides with mixed electronic-ionic conduction are important catalysts for the oxygen reduction reaction in solid oxide fuel cells (SOFCs). Here, two cobalt-free perovskite oxides, LaFe0.8Cu0.2O3- (LFCuO) and BaFe0.8Cu0.2O3- (BFCuO), were synthesized and comparatively studied with respect to their phase structures, oxygen contents, chemical defects, thermal expansion coefficient (TEC), as well as electrical and electrochemical properties. Different structures and properties have been found for each oxide, which have been interpreted based on their tolerance factors and chemical defects. LFCuO showed much better overall performance than BFCuO, and it proved to be a promising cobalt-free cathode material of intermediate-temperature SOFCs with a low TEC (12.0×10-6 °C-1) that matches well with TECs of the electrolytes, high catalytic activity for the oxygen reduction reaction characterized by low area specific resistances (0.090 Ω cm2 at 800 °C and 0.20 Ω cm2 at 750 °C), and high-temperature chemical stability with electrolytes.
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