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摘要
A Ni doping strategy was used to improve the performance of spinel oxide CuFe2O4 cathode material for solid oxide fuel cells (SOFCs). CuFe2?xNixO4 (x=0, 0.01, 0.03, 0.05, 0.10) powders were prepared by using a sol-gel method. Phase composition, high temperature chemical compatibility with electrolyte, electrical conductivity, thermal expansion coefficient and electrochemical properties of the cathodes in half cell were thematically studied. CuFe1.95Ni0.05O4 exhibited the maximum electrical conductivity and the minimum polarization impedance, with values to be 5.21 S·cm?1 and 2.89 Ω·cm2 at 800 ℃, respectively. Both the electrical conductivity and oxygen vacancy concentration could be optimized by controlling the doping concentration of Ni. In this case, the oxygen reduction activity of the material was boosted and the rate determining step in the oxygen reduction process was varied from charge transfer process to oxygen adsorption and dissociation process. ? 2022 Editorial Office of Journal of Ceramics
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