Journal of Alloys and Compounds p. 519 - 525 (2019)
Update date:2022-08-18
Topics:
Mao, Jialun
Peng, Shuting
Zhang, Chao
Qi, Siming
Cui, Jinghao
Gong, Yuhan
Wang, Shaoshuai
Wu, Chongrui
Zhou, Qingjun
A Ruddlesden-Popper phase, (Pr0.9La0.1)2?x(Ni0.74Cu0.21Al0.05)O4+δ ((PL)2?xNCA, x = 0, 0.05 and 0.1), is synthesized and characterized for use as a cathode material in intermediate temperature solid oxide fuel cells (IT-SOFCs). The effects of A-site cation deficiency on the thermal expansion coefficient, electrical conductivity, electrochemical properties, and thermal stability are investigated in detail. (PL)2?xNCA and the Ce0.8Sm0.2O1.9 (SDC)electrolyte are chemically compatible at 1000 °C for 5 h. The average thermal expansion coefficient (TEC)values of (PL)2?xNCA range from 14.1 × 10?6 K?1 to 14.5 × 10?6 K?1 for temperatures between 30 and 1000 °C, which is close to that of conventional SOFC electrolyte materials. The (PL)2?xNCA samples were unstable after heating to 700 and 800 °C for 72 h in air. The (PL)1.9NCA cathode had a minimum area specific resistance (ASR)of 0.033 Ω cm2 at 800 °C. When (PL)2.0NCA was used as the cathode material in electrolyte-supported single cells, the single cell reached a maximum power density of 527 mW cm?2 at 800 °C using an SDC electrolyte.
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