Monovalent ion doping to enhance the performance of cobalt-free Sm0.5Sr0.5FeO3-δ cathode for YSZ fuel cells

被引:9
|
作者
Yang, Quan [1 ,2 ]
Sun, Taoli [1 ]
Ding, Yanzhi [1 ]
Lu, Xiaoyong [1 ]
Tian, Dong [1 ,3 ,4 ]
Lin, Bin [1 ,2 ]
机构
[1] Huainan Normal Univ, Anhui Prov Key Lab Low Temp Cofired Mat, Huainan 232038, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Mech & Elect Engn, Chengdu 611731, Peoples R China
[3] Anhui Univ Sci & Technol, Sch Mat Sci & Engn, Huainan 232038, Peoples R China
[4] Huainan Normal Univ, Huainan Engn Res Ctr Fuel Cells, Anhui Key Lab Low Temp Cofired Mat, Huainan 232001, Peoples R China
关键词
Monovalent ion doping; Cobalt-free perovskite cathode; YSZ fuel cells; Oxygen reduction reaction; PEROVSKITE CATHODE; OXYGEN REDUCTION; OXIDE; ELECTROLYTE; SOFC; X=0;
D O I
10.1016/j.jallcom.2023.171967
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Solid oxide fuel cells (SOFCs) are energy conversion devices that can solve the energy crisis and environmental pollution, but the low electrochemical performance at intermediate temperatures is still an urgent problem to be addressed. In this work, we investigate the effect of K and F doping on the performance of conventional cobaltfree cathode SSF. XRD demonstrates that SSF, SSKF, SSFF, and SSKFF each display a cubic perovskite structure. Additionally, HT-XRD reveals that SSF, SSKF, and SSFF exhibit exceptional thermal stability, while SSKFF produces the impurity phase Sr3Fe2O7 during the test. XPS suggests that the improvement in SSF performance, resulting from F and K doping, can be largely attributed to the increase in adsorbed oxygen content, which enhances the ORR catalytic activity. The O-2-TPD outcomes indicate that F and K doping stimulate the formation of oxygen vacancies at higher temperatures, thus promoting ORR catalytic activity. Experimentally, the electrochemical impedance spectra results indicate that both K and F doping led to a reduction in the value of polarization resistance, which decreased by over 20% at 800 degrees C. Regarding the output performance, both K and F doping resulted in a substantial increase in the output power from 670.05 to 825.88 and 796.76 mW center dot cm(-2) respectively, at 800 degrees C. However, co-doping with F and K led to a notable reduction in polarization impedance and output power, possibly due to the formation of heterogeneous phases during testing. The results indicate that enhancing the electrochemical performance of SSF can be achieved through the doping of K cations and F anions, but co-doping leads to a decreased performance.
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页数:10
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