Metal-supported Solid Oxide Fuel Cell with La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ Cathode
Metal-supported Solid Oxide Fuel Cell with La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ Cathode
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DOI：
10.1149/06801.0927ecst
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
T. Zhu;Minfang Han;Zhibin Yang
中科院分区：
文献类型：
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作者：
T. Zhu;Minfang Han;Zhibin Yang
研究了金属负载固体氧化物燃料电池(SOFC)的制备新方法。以NiO和Fe2 O3(Ni：Fe=1：1)氧化物为载体，NiO-Gd0.1Ce0.9O1.95(GDC)为阳极，GDC电解液为电解液，La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ(LSCFN)为阴极，用传统的陶瓷加工方法在空气中制备了单电池。随后，将所制备的整个电池在700℃的5%H2-95%N2中加热1h，以得到金属氧化物载体。结果表明，在700℃的还原气氛中热处理1h后，氧化物载体大部分被还原成金属，而LSCFN阴极仍保持其钙钛矿结构，并有轻微的氧损失，在典型的电池测试温度700C下，在空气中被证明是可逆的氧化还原。此外，电化学阻抗谱(EIS)结果表明，LSCFN对称电池在空气中的极化电阻在5%H2-95%N2加湿空气中氧化还原循环一次后降低，这表明在可能的混合价态Fe3+/Fe4+和Co2+/Co3+氧化还原对的重排和氧空位的分布后，LSCFN阴极的性能得到了优化。
In this paper, a new approach for metal-supported Solid Oxide Fuel Cell (SOFC) fabrication was investigated. Single cell with NiO and Fe 2 O 3 (Ni: Fe= 1: 1) oxide support, NiO-Gd 0.1 Ce 0.9 O 1.95 (GDC) anode, GDC electrolyte and La 0.4 Sr 0.6 Co 0.2 Fe 0.7 Nb 0.1 O 3-δ (LSCFN) cathode was prepared through traditional ceramic processing methods in air. Subsequently, the as-prepared whole cell was annealed in the humidified 5% H 2-95% N 2 at 700 C for 1 hour to get the metal oxide support reduced. Results show that after being annealed in the reducing atmosphere at 700 C for 1 hour, the oxide support was mostly reduced into metal, while the LSCFN cathode maintained its perovskite structure with slightly oxygen loss which was proved redox reversible in air at the typical cell test temperature of 700 C. Fully reduced Ni-Fe metal support could be obtained during the cell test condition with humidified H 2 sweeping at the anode side. Furthermore, electrochemical impedance spectroscopy (EIS) results show that the polarization resistance of LSCFN symmetrical cell in air decreased after one redox cycle between the humidified 5% H 2-95% N 2 and air, suggesting the performance optimization of LSCFN cathode after the possible rearrangement of mixed-valence Fe 3+/Fe 4+ and Co 2+/Co 3+ redox couples and distribution of oxygen vacancies.