Evaluation of performances of solid oxide fuel cells with symmetrical electrode material
Evaluation of performances of solid oxide fuel cells with symmetrical electrode material
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DOI：
10.1016/j.jpowsour.2014.05.013
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发表时间：
2014-11
影响因子：
9.2
通讯作者：
Peng Zhang;G. Guan;D. S. Khaerudini;Xiaogang Hao;Chunfeng Xue;Minfang Han;Yutaka Kasai;A. Abudula-A.-Ab
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文献类型：
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作者：
Peng Zhang;G. Guan;D. S. Khaerudini;Xiaogang Hao;Chunfeng Xue;Minfang Han;Yutaka Kasai;A. Abudula-A.-Ab
本课题组已开发出PrxSr0.6Co0.2Fe0.7Nb0.1O3−σ(PxSCFN,x= 0.38, 0.40, 0.42 and 0.44)氧化物作为固体氧化物燃料电池（SOFC）的对称电极材料。本研究详细研究了Pr元素含量对PxSCFN对称电极SOFC电池性能的影响。性能测试后，采用电化学阻抗谱（EIS）技术、扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）对电极进行表征。研究发现，阳极侧明显形成纳米级富Co颗粒，这有助于PxSCFN对称电极材料的高催化活性。 PxSCFN 对称电极材料的最佳 x 值为 0.42。所制备的单电池在 100 h 稳定性测试中显示出平均缓慢降解率为 0.5 mV h−1，表明以 PSCFN 作为电极的对称 SOFC 具有可接受的稳定性。 X射线光电子能谱(XPS)分析表明，在A位Pr元素稍过量的情况下，表面Sr2+物种的含量有所降低，这可能导致PSCFN材料催化性能的提升。
PrxSr0.6Co0.2Fe0.7Nb0.1O3−σ(PxSCFN,x= 0.38, 0.40, 0.42 and 0.44) oxide has been developed as symmetrical electrode material for solid oxide fuel cell (SOFC) in our group. In this study, the effect of Pr element contents on the cell performance of the PxSCFN symmetrical electrode SOFC is investigated in details. Electrochemical impedance spectra (EIS) technique, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) are used to characterize the electrodes after the performance test. It is found that the nano-sized Co-enriched particles are obviously formed in anode side, which could contribute to the high catalytic activity of the PxSCFN symmetrical electrode materials. An optimumxvalue, i.e., 0.42, is found for the PxSCFN symmetrical electrode materials. As-prepared single cell shows an average slow degradation rate of 0.5 mV h−1during 100 h stability test, indicating that the symmetrical SOFC with PSCFN as electrode has the acceptable stabilization. X-ray photoelectron spectroscopy (XPS) analysis indicated that the content of Sr2+species on the surface decreases to some extent in the case of A-site Pr element slight excess, which could result in the promoting of the catalytic properties of PSCFN material.