Novel BaCo_0.7Fe_0.3−y

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• 作者：Chengjun Zhu ; Xiaomei Liu ; Cuishan Yi ; Li Pei ; Duanting Yan ; Jiangpo Niu ; Dejun Wang ; Wenhui Su
• 关键词：Solid oxide fuel cell ; Cathode ; BaCo_0.7Fe_0.3− ; _yNb_yO₃₋ ; _δ ; ; Electrochemical performance
• 刊名：Electrochemistry Communications
• 出版年：2009
• 出版时间：May 2009
• 年：2009
• 卷：11
• 期：5
• 页码：958-961
• 全文大小：462 K

文摘

The BaCo_0.7Fe_0.3−yNb_yO_3−δ oxides (BCFNy, y = 0.00–0.12) were synthesized by the conventional solid state reaction process and investigated as a novel cathode for intermediate temperature solid oxide fuel cells(IT-SOFCs). Cubic perovskite, with enhanced phase stability at higher Nb concentration, was obtained at y  0.04. The unit cell volumes increased with y, reached a maximum at y = 0.10, and then decreased. The niobium doping concentration also had a significant effect on the electrochemical performance of BCFNy materials. Among the various BCFNy oxides tested, BCFN0.10 possessed the smallest interfacial polarization resistance (R_p). The R_p was as low as 0.9406, 0.1300, 0.0211, and 0.0082 Ω cm² at 500, 600, 700, and 800 °C, respectively. With a 220 μm-thick Sm_0.2Ce_0.1O_1.9 (SDC) as electrolyte and BCFN0.10 as the cathode, a fuel cell provides maximum power densities of 202, 350, 569, 820, and 1006 mW cm⁻² at 600, 650, 700, 750, and 800 °C, respectively. The encouraging results suggested that BCFN0.10 was a very promising cathode material for IT-SOFCs.