A niobium and tungsten co-doped SrFeO3-delta perovskite as cathode for intermediate temperature solid oxide fuel cells
A niobium and tungsten co-doped SrFeO3-delta perovskite as cathode for intermediate temperature solid oxide fuel cells
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铌钨共掺杂 SrFeO3-δ 钙钛矿作为中温固体氧化物燃料电池的阴极
DOI：
10.1016/j.ceramint.2019.01.019
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发表时间：
2019
影响因子：
5.2
通讯作者：
Meng Fanzhi
中科院分区：
文献类型：
--
作者：
Yao Chuangang;Zhang Haixia;Liu Xiaojuan;Meng Junling;Meng Jian;Meng Fanzhi
采用Nb和W共掺杂的SrFeO 3-δ钙钛矿结构材料SrNb 0.1W0.1Fe0.8O3-δ（SNWF）作为中温固体氧化物燃料电池（IT-SOFC）的新型阴极材料。SNWF具有立方结构，空间群为Pm 3 <$m。详细研究了其热学、电学和电化学性能。Nb/W共掺杂使SNWF的氧空位密度比Nb和W单掺杂的SrNb0.2Fe0.8O3-δ（SNF）和SrW0.2Fe0.8O3-δ（SrW）钙钛矿的氧空位密度增加。Nb/W共掺杂降低了材料的电导率，提高了材料的热膨胀系数和电化学性能。SNWF在30-1000° C期间的平均TEC值为19.6× 10− 6 K− 1。在750° C时，以SNWF电极和La0.8Sr0.2Ga0.8Mg0.1O3（LSGM）电解质为基础的电池的面积比电阻（ASR）和最大功率密度分别为0.113 Ω cm-2和832 mW cm-2。良好的ORR活性和输出性能表明SNWF可以作为IT-SOFC的良好替代阴极材料。
Nb and W co-doped SrFeO 3-δ perovskite SrNb 0.1 W 0.1 Fe 0.8 O 3-δ (SNWF) is exploited as a novel cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). SNWF has a cubic structure with Pm 3¯ m space group. Its thermal, electrical and electrochemical properties were examined in detail. Nb/W co-doping increased the oxygen vacancy density of SNWF in comparison with that of Nb and W single-doped SrNb 0.2 Fe 0.8 O 3-δ (SNF) and SrW 0.2 Fe 0.8 O 3-δ (SWF) perovskites. Nb/W co-doping resulted in the decrease of electrical conductivity and the enhancement of thermal expansion coefficients (TECs) as well as the electrochemical performance. The average TEC value during 30–1000° С is 19.6× 10− 6 K− 1 for SNWF. At 750° C, the area specific resistance (ASR) and the maximum power density are 0.113 Ω cm 2 and 832 mW cm− 2 for the cells based on SNWF electrode and La 0.8 Sr 0.2 Ga 0.8 Mg 0.1 O 3 (LSGM) electrolyte. Good ORR activity and output performance indicate SNWF can be a good alternative cathode material for IT-SOFC.