【摘 要】
：
In response to the shortcomings of cobalt-rich cathodes,iron-based perovskite oxides appear as promis-ing alternatives for solid oxide fuel cells(SOFCs).However,their inferior electrochemical performance at reduced temperatures(＜700℃)becomes a major bottl
【机 构】
：
Guangzhou Key Laboratory of Clean Transportation Energy Chemistry,School of Chemical Engineering and
论文部分内容阅读
In response to the shortcomings of cobalt-rich cathodes,iron-based perovskite oxides appear as promis-ing alternatives for solid oxide fuel cells(SOFCs).However,their inferior electrochemical performance at reduced temperatures(＜700℃)becomes a major bottleneck for future progress.Here,a novel cobalt-free perovskite Ba0.75Sr0.25Fe0.875Ga0.125O3-δ(BSFG)is developed as an efficient oxygen reduction electrode for SOFCs,featuring cubic-symmetry structure,large oxygen vacancy concentration and fast oxygen trans-port.Benefiting from these merits,cells incorporated with BSFG achieve exceptionally high electrochem-ical performance,as evidenced by a low polarization area-specific resistance of 0.074 Ω cm2 and a high peak power density of 1145 mW cm-2 at 600℃.Meanwhile,a robust short-term performance stability of BSFG cathode can be ascribed to the stable crystalline structure and favorable thermal expansion behav-ior.First-principles computations are also conducted to understanding the superior activity and durabil-ity toward oxygen reduction reaction.These pave the way for rationally developing highly active and robust cobalt-free perovskite-type cathode materials for reduced-temperature SOFCs.
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