材料科学
阴极
烧结
氧化物
微观结构
固体氧化物燃料电池
复合数
耐久性
电化学
化学工程
复合材料
电极
冶金
阳极
化学
物理化学
工程类
作者
Can Hu,Duan Li,Zehua Pan,Yan Gao,Jiadong Zang,Wenhao Fu,Wenlong Lu,Zheng Zhong,Haibo Zhang,Zhimiao Yan
标识
DOI:10.1016/j.ceramint.2024.04.002
摘要
In this study, nano-sized Al2O3 and Gd0.1Ce0.9O1.95 (GDC) particles are added to La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode material as sintering inhibitors for solid oxide fuel cells (SOFC) to improve the stability of the cell performance. Studies reveal that as the amount of the inhibitors increases, the sintering activation energy of the composite LSCF sample increases, resulting in retarded sintering kinetics indicated by the suppressed grain size of the sintered composite LSCF cathode. Long-term durability tests show that due to the enhanced stability of the microstructure of the composite LSCF cathode, the composite cathode exhibits improved performance stability. Furthermore, both the Al2O3 and GDC additions can improve the hardness and elastic modulus of the cathode, while the electrical conductivity of both cathodes exceed 100 S/cm and can still meet the requirements for the SOFC in the operation temperature range of 600–800 °C. In light of the boosted electrochemical durability of the Al2O3-added LSCF cathode and much lower cost of Al2O3 compared to the rare-earth element based GDC materials, LSCF cathode with a proper amount of the nano-sized Al2O3 inhibitors is a good solution to enhance the mechanical property, electrochemical durability of LSCF cathode for the SOFCs at low cost.
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