Synthesis and properties of Ba0.5Sr0.5(Co0.6Zr0.2)Fe0.2O3−δ perovskite cathode material for intermediate temperature solid-oxide fuel cells
Synthesis and properties of Ba0.5Sr0.5(Co0.6Zr0.2)Fe0.2O3−δ perovskite cathode material for intermediate temperature solid-oxide fuel cells
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中温固体氧化物燃料电池Ba0.5Sr0.5(Co0.6Zr0.2)Fe0.2O3−δ钙钛矿正极材料的合成及性能
DOI：
10.1016/j.materresbull.2008.12.015
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发表时间：
2009
影响因子：
5.4
通讯作者：
Zifeng Ma
中科院分区：
文献类型：
--
作者：
Xiuxia Meng;Bo Meng;X. Tan;Naitao Yang;Zifeng Ma
采用改进的−δ-柠檬酸络合技术结合高温烧结，合成了高稳定的中温固体氧化物燃料电池正极材料Ba0.5Sr0.5(Co0.6Zr0.2)Fe0.2O3BSCZF(BSCZF)。用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和交流阻抗谱(EIS)对产物进行了表征。制备了电解液支撑的BSCZF/SDC/Ni-SDC燃料电池，对材料的性能进行了评价。X射线衍射分析表明，当烧结温度高于950℃时，就足以形成纯净的BSCZF钙钛矿相。与Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba0.5Sr0.5Co0.8Fe0.2O3Ba在540°C附近，BSCZF的最大电导率达到16.9Scm−1。阻抗谱表明，在相同条件下，掺杂Ce0.8Sm0.2O1.9(Ce0.8Sm0.2O1.9，SDC)电解液的BSCZF阴极的ASR较低，但仍略大于BSCF。BSCZF/SDC/Ni-SDC电池具有稳定的输出，最大功率密度分别为30，75,139和241mWcm−2，分别为550,600,650和700°C。BSCZF钙钛矿具有高的电化学性能和良好的稳定性，有望成为IT-SOFC的一种极具吸引力的正极材料。
A highly stable perovskite cathode material, Ba0.5Sr0.5(Co0.6Zr0.2)Fe0.2O3−δ(BSCZF) for intermediate temperature solid-oxide fuel cells (IT-SOFCs) was synthesized via the improved EDTA–citric acid complexing technique combined with high-temperature sintering. The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectra (EIS) measurements. An electrolyte-supported BSCZF/SDC/Ni-SDC fuel cell was fabricated to evaluate the performance of the material. The XRD study indicates that the sintering temperature higher than 950°C is sufficient to the formation of clean single BSCZF perovskite phase. Due to the incorporation of Zr ions, BSCZF perovskite exhibit lower electrical conductivity with higher activation energy but higher structural stability than the Ba0.5Sr0.5Co0.8Fe0.2O3−δ(BSCF) parent oxide. The maximum electrical conductivity of BSCZF attains 16.9Scm−1at around 540°C. Impedance spectra showed that the ASRs of BSCZF cathode on samaria doped ceria (Ce0.8Sm0.2O1.9, SDC) electrolyte are low but are still slightly larger than those of BSCF at similar conditions. The BSCZF/SDC/Ni-SDC cell exhibited a stable output with the maximum power densities of 30, 75, 139 and 241mWcm−2at 550, 600, 650 and 700°C, respectively. Due to the high electrochemical performances as well as the excellent stability, BSCZF perovskite may be an attractive cathode material for IT-SOFCs.