阴极
材料科学
钙钛矿(结构)
热膨胀
电化学
电解质
兴奋剂
热稳定性
氧化物
氧气
固体氧化物燃料电池
功率密度
化学工程
分析化学(期刊)
电极
化学
复合材料
光电子学
冶金
物理化学
热力学
功率(物理)
有机化学
色谱法
工程类
物理
作者
Jinghe Bai,Defeng Zhou,Leilei Niu,Ruyi Chen,Xiaofei Zhu,Ning Wang,Qingwen Liang,Wenfu Yan
标识
DOI:10.1016/j.ssi.2023.116377
摘要
The development of cathode materials with high oxygen reduction reaction (ORR) activity and stability in intermediate temperature (IT) environments is a key factor in the commercialization of solid oxide fuel cells (SOFC). In this paper, the ORR activity of the cathode is improved by doping high-valent Sc3+ ions at the B-site of the Sr0.5La0.5Co0.8Cu0.2-xScxO3–δ (x = 0, 0.02, 0.04), in which Sr0.5La0.5Co0.8Cu0.18Sc0.02O3–δ (SLCCS2) shows the best electrochemical performance, and the area-specific resistance of SLCCS2 at 700 °C is only 0.047 Ω cm2, much lower than the 0.087 Ω cm2 of Sr0.5La0.5Co0.8Cu0.2O3–δ (SLCC), and the peak power density of SLCCS2 reached 1.098 W cm−2, which is 1.84 times that of SLCC (0.598 W cm−2). In addition, SLCCS2 effectively reduces the thermal expansion coefficient, improves thermal matching with traditional electrolytes, and overcomes the problem of insufficient long-term SOFC stability caused by the high thermal expansion coefficient of Co-based perovskite to a certain extent. SLCCS2 also exhibits excellent CO2 tolerance. Considering comprehensively, SLCCS2 is expected to become an IT-SOFC cathode material with development potential.
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