K2NiF4 type La2-zSrzCo0.8Ni0.2O4+δ as the cathodes for solid ozide fuel cells
K2NiF4 structured La2Co0.8Ni0.2O4+δ is an oxygen overstoichiometric oxide with high oxygen diffusion and oxygen surface exchange coefficients at temperature range 450-800℃. In this work, composites consisting of La2-xSrxCo0.8Ni0.2O4+δ (LSCN, x=0,0.4,0.8,1.2,1.6) and Ce0.9Gd0.1O1.95 (GDC) have been investigated as the cathodes for low-and-intermediate temperature solid oxide fuel cells (SOFCs). AC impedance spectroscopy on symmetric cells indicated that among the series of LSCN-GDC composites, La1.2Sr0.8Co0.8Ni0.2O4+δ-based electrode had the lowest interfacial polarization resistance, which was 1.36 Ω cm2 at 600℃ when the electrode was not activated. Significant activation effect was observed with a single cell when current treatment was performed at 200 mA cm-2 within 30 min. The single cell with La1.2Sr0.8Co0.8Ni0.2O4+δ-GDC as the cathode generated power density up to 350 mW cm-2 at 600℃. In addition, the performance was pretty stable when a constant output voltage of 0.5 V was set for 36 h. These results suggest that La2-xSrxCo0.8Ni0.2O4+δ could be promising materials as the cathodes for SOFCs that operated at low-and-intermediate temperatures.
Solid ozide fuel cell La2-zSrzCo0.8Ni0.2O4+δ K2NiF4 type ozide Composite cathode Doped ceria
Fei Zhao Xiangfeng Wang Zhiyong Wang Ranran Peng Changrong Xia
Laboratory for Renewable Clean Energy, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1450-1453
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）