兴奋剂
氧化物
燃料电池
材料科学
固体氧化物燃料电池
钙钛矿(结构)
化学
化学工程
冶金
结晶学
光电子学
物理化学
阳极
电极
工程类
作者
Ze Wei,Xueqing Xiong,Xiyong Chen,Juntao Pan,Donglin Cai,Xiaomei Huang,Gang Han,Yihui Liu,Zezuo Jiang,Toyohisa Fujita
标识
DOI:10.1016/j.jallcom.2024.174860
摘要
The effects of Sr doping on the crystal structures, thermal expansion behaviors, defect chemistries, electrical and electrochemical properties of the perovskite materials, La0.5Gd0.5Ba1−xSrxCo2O5+δ (LGBCOSr-x, x=0–0.5), were systematically analyzed and discussed. The X-ray diffraction (XRD) investigation revealed that LGBCOSr-x undergoes a phase transformation from tetragonal (x=0.1) to cubic (x=0.5), and the materials exhibit good thermochemical compatibility with Ce0.9Gd0.1O1.95 (GDC) under 1100 °C. Partial replacement of Ba with Sr is found helpful in decreasing the thermal expansivity of LGBCOSr-x and increasing the ability of oxygen vacancy formation in the materials. The latter could be attributed to the enhancement in the overall electrical conductivity and oxygen transport process in terms of low cathodic polarization resistance in LGBCOSr-x materials with high Sr doping content. Further analysis on the AC impedance spectroscopy assisted with the DRT (distribution of relaxation times) methodology suggested that the charge transfer sub-process is a predominant step in the oxygen transport processes across the LGBCOSr-x materials. These findings indicate that La0.5Gd0.5Ba1−xSrxCo2O5+δ is a promising cathode material for intermediate temperature solid oxide fuel cells.
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