Tuning Ba0.5Sr0.5Co0.8Fe0.2O3-δ cathode to high stability and activity via Ce-doping for ceramic fuel cells |
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| Affiliation: | 1. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, PR China;2. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, PR China;3. Anhui Key Laboratory of Low-Temperature Co-Fired Material, Huainan Engineering Research Center for Fuel Cells, Huainan Normal University, Huainan, 232001, PR China |
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| Abstract: | Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) fuel-cell cathode stands out because of its ultrahigh ionic conductivity and excellent electrocatalytic activity, but it is still very subject to instability. Here, a new strategy of Ce doping is proposed to boost the stability and activity of the BSCF cathode. A one-pot combustion method is employed to synthesize (Ba0.5Sr0.5)1–xCexCo0.8Fe0.2O3-δ (x=0–0.2) cathodes. Both BSCF and (Ba0.5Sr0.5)0.9Ce0.1Co0.8Fe0.2O3-δ have a cubic perovskite structure. (Ba0.5Sr0.5)0.8Ce0.2Co0.8Fe0.2O3-δ shows two phases of cubic perovskite and fluorite ceria. Proper Ce doping can boost the electrical conductivity of BSCF, and can dramatically reduce the polarization resistance of BSCF cathode. Ce doping significantly improved BSCF cathode long-term stability by 160 h. Moreover, ten-percent Ce doping in BSCF highly improves single-cell output performance from 516.33 mW cm?2 to 629.75 mW cm?2 at 750 °C. The results reveal that Ce doping as a potential strategy for enhancing the stability and activity of BSCF cathode is promising. |
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| Keywords: | Ceramic fuel cell BSCF cathode Ce doping Long-term stability |
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