Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 21, Pages 23959-23967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04605
Keywords
energy conversion; solid oxide fuel cells; cathode; layered double perovskite oxide; oxygen reduction reaction; Zn2+ doping
Funding
- National Natural Science Foundation of China [21376001, 21576028, 21506012]
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Mixed oxygen ionic and electronic conduction is a vital function for cathode materials of solid oxide fuel cells (SOFCs), ensuring high efficiency and low-temperature operation. However, Fe-based layered double perovskites, as a classical family of mixed oxygen ionic and electronic conducting (MIEC) oxides, are generally inactive toward the oxygen reduction reaction due to their intrinsic low electronic and oxygen-ion conductivity. Herein, Zn doping is presented as a novel pathway to improve the electrochemical performance of Fe-based layered double perovskite oxides in SOFC applications. The results demonstrate that the incorporation of Zn ions at Fe sites of the PrBaFe2O5+delta (PBF) lattice simultaneously regulates the concentration of holes and oxygen vacancies. Consequently, the oxygen surface exchange coefficient and oxygen-ion bulk diffusion coefficient of Zn-doped PBF are significantly tuned. The enhanced mixed oxygen ionic and electronic conduction is further confirmed by a lower polarization resistance of 0.0615 and 0.231 Omega.cm(2) for PrBaFe1.9Zn0.1O5+delta (PBFZ0.1) and PBF, respectively, which is measured using symmetric cells at 750 degrees C. Moreover, the PBFZ0.1-based single cell demonstrates the highest output performance among the reported Fe-based layered double perovskite cathodes, rendering a peak power density of 1.06 W center dot cm(-2) at 750 degrees C and outstanding stability over 240 h at 700 degrees C. The current work provides a highly effective strategy for designing cathode materials for next-generation SOFCs.
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