Upgrading the performance of La₂Mo₂O₉-based solid oxide fuel cell under single chamber conditions

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• 作者：Chi-Chieh Yao^a ; Dah-Shyang Tsai^a ; ^{dstsai@mail.ntust.edu.tw} ; ^{dst2004vancouver@yahoo.com.tw} ; Jen-Chieh Lo^a ; Wen-Hung Chung^a ; David P. Wilkinson^b
• 关键词：Solid oxide fuel cell ; Anode support ; La2Mo2O9 ; Electrolyte
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：June, 2012
• 卷：37
• 期：12
• 页码：9792-9800
• 文件大小：1669 K

摘要

Various anode-supported solid oxide fuel cells (SOFC), based on 10聽mol%Dy-doped La₂Mo₂O₉ (LDM) electrolyte, are prepared analytically and operated under single chamber conditions to explore the connections between electrode and power performance. The cathode of tested SOFCs is compositionally graded with three composites of samarium strontium cobaltite and Gd-doped ceria (GDC) to relax the thermal stress, because of sizable thermal expansion differences above 400聽掳C. We focus the research attention on varying the anode pore structure and composition to promote the power performance in methane/air mixture at 700聽掳C. For the one-layer support of GDC+NiO+LDM anode, addition of 10聽wt%graphite minimizes its mass transport resistance through creating 8-5聽渭m long and 鈭?聽渭m wide slit-shaped pores. The graphite pore former raises the peak power value by 80聽mW聽cm^鈭?. Adopting a more porous and active outer layer, the double-layer support further enhances the cell power. The peak power was first raised by 48聽mW聽cm^鈭?, using an outer layer that was prepared with 63聽wt%NiO. Dosing 3%Pd on this outer layer uplifts another 59聽mW聽cm^鈭?. In this study, with an improved anode, the peak power value reaches 437聽mW聽cm^鈭?.