Further performance enhancement of a DME-fueled solid oxide fuel cell by applying anode functional catalyst

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• 作者：Chao Su^a ; Wei Wang^a ; Ran Ran^a ; Tao Zheng^b ; ^{hellozheng@gmail.com} ; Zongping Shao^a ; ^c ; ^{shaozp@njut.edu.cn} ; ^{zongping.shao@monash.edu}
• 关键词：Dimethyl ether ; Solid oxide fuel cells ; Catalyst ; Partial oxidation ; Coke formation
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：8
• 页码：6844-6852
• 文件大小：1355 K

摘要

In order to increase the coking resistance of SOFCs operating on DME fuel, a Pt/Al₂O₃-Ni/MgO mixture catalyst was investigated for internal partial oxidation of DME. Catalytic test demonstrated the mixture catalyst has higher activity for DME partial oxidation and lower CH₄ selectivity than the individual Pt/Al₂O₃ and Ni/MgO catalysts. O₂-TPO analysis demonstrated that the mixture catalyst also had much higher coke resistance than sintered Ni-YSZ anode, especially at high O₂ to DME ratio. Raman spectroscopy of the carbon-deposited catalysts demonstrates that the graphitization degree of carbon is reduced with introducing O₂ into DME, and the carbon deposited on the mixture catalyst is almost in amorphous structure. Two operation modes of the mixture catalyst for indirect internal partial oxidation of DME, i.e, directly depositing on the anode surface and locating in the anode chamber were tried. The performance of the cells operating on DME fuel through both operation modes was studied by I-V polarization test and EIS characterization. The cells delivered attractive peak power density of around 750聽mW聽cm^鈭? by operating on DME-O₂ mixture gas, modestly lower than 1012-1065聽mW聽cm^鈭? operating on pure hydrogen fuel at 700聽掳C. The direct deposition of Pt/Al₂O₃-Ni/MgO onto anode surface to perform as a functional layer and a DME to O₂ ratio of 2:1 in the mixture gas is preferred to minimize coke formation and maximize power output for the cell to operate on DME fuel.