High performance cathode-supported SOFC with perovskite anode operating in weakly humidified hydrogen and methane

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• 作者：X.J. Chen ; Q.L. Liu ; S.H. Chan ; N.P. Br ; on ; K.A. Khor
• 关键词：Solid oxide fuel cell ; Cathode-supported ; Perovskite anode ; Impregnation ; Methane oxidation ; Thin film
• 刊名：Electrochemistry Communications
• 出版年：2007
• 出版时间：April 2007
• 年：2007
• 卷：9
• 期：4
• 页码：767-772
• 全文大小：578 K

文摘

A high performance cathode-supported solid oxide fuel cell (SOFC), suitable for operating in weakly humidified hydrogen and methane, has been developed. The SOFC is essentially made up by a YSZ/LSM composite supporting cathode, a thin YSZ film electrolyte, and a GDC-impregnated La_0.75Sr_0.25Cr_0.5Mn_0.5O₃ (LSCM) anode. A gas tight thin YSZ film (27 μm) was formed during the co-sintering of cathode/electrolyte bi-layer at 1200 °C. The cathode-supported SOFC developed in this study showed encouraging performance with maximum power density of 0.182, 0.419, 0.628 and 0.818 W cm⁻² in air/3 % H₂O–97 % H₂ (and 0.06, 0.158, 0.221 and 0.352 W cm⁻² in air/3 % H₂O–97 % CH₄) at 750, 800, 850 and 900 °C, respectively. Such performance is close to that of the cathode-supported cell (0.42 W cm⁻² vs. 0.455 W cm⁻² in humidified H₂ at 800 °C) developed by Yamahara et al. [Solid State Ionics 176 (2005) 451–456] with a Co-infiltrated supporting LSM-YSZ cathode, a (Sc₂O₃)_0.1(Y₂O₃)_0.01(ZrO₂)_0.89 (SYSZ) electrolyte of 15 μm in thickness and a SYSZ/Ni anode, indicating that the performance of the GDC-impregnated LSCM anode is comparable to that made of Ni cermet while stable in weakly humidified methane fuel.