Symmetrical solid oxide fuel cells with impregnated SrFe_0.75Mo_0.25O_{3鈭?span style='font-style: italic'>未} electrodes

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• 作者：Xie Meng ; Xuejiao Liu ; Da Han ; Hao Wu ; Junliang Li ; Zhongliang Zhan
• 关键词：Solid oxide fuel cells ; Strontium and magnesium doped lanthanum gallate ; Molybdenum doped strontium ferrite ; Nanostructure ; Impregnation
• 刊名：Journal of Power Sources
• 出版年：15 April, 2014
• 年：2014
• 卷：252
• 期：Complete
• 页码：58-63
• 全文大小：939 K

文摘

Here we report nominally symmetrical solid oxide fuel cells that feature thin La_0.9Sr_0.1Ga_0.8Mg_0.2O_3鈭?em>未 (LSGM) electrolytes and impregnated SrFe_0.75Mo_0.25O_3鈭?em>未 (SFMO)-LSGM composite electrodes. Operation on hydrogen fuels and air oxidants can produce maximum power densities of 0.39聽W聽cm^鈭? at 650聽掳C and 0.97聽W聽cm^鈭? at 800聽掳C. Impedance measurements indicate that the anode and the cathode polarizations are 0.22 and 0.04聽惟聽cm² at 800聽掳C, respectively. Hydrogen partial pressure and temperature dependence of impedance data in humidified hydrogen shows that hydrogen oxidation kinetics is largely determined by hydrogen adsorption on the SFMO catalysts at high temperatures and charge transfer reactions along the SFMO|LSGM interfaces at low temperatures. Carbon tolerance of the present fuel cells is also examined in iso-octane fuels balanced by nitrogen at 800聽掳C that yields stable maximum power densities of 0.39聽W聽cm^鈭?.