Highly CO2-Tolerant Cathode for Intermediate-Temperature Solid Oxide Fuel Cells: Samarium-Doped Ceria-Protected SrCo0.85Ta0.15O3−δsub> Hybrid

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• 作者：Mengran Li ; Wei Zhou ; Zhonghua Zhu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：9
• 期：3
• 页码：2326-2333
• 全文大小：560K
• ISSN：1944-8252

文摘

Susceptibility to CO<sub>2sub> is one of the major challenges for the long-term stability of the alkaline-earth-containing cathodes for intermediate-temperature solid oxide fuel cells. To alleviate the adverse effects from CO<sub>2sub>, we incorporated samarium-stabilized ceria (SDC) into a SrCo<sub>0.85sub>Ta<sub>0.15sub>O<sub>3−δsub> (SCT15) cathode by either mechanical mixing or a wet impregnation method and evaluated their cathode performance stability in the presence of a gas mixture of 10% CO<sub>2sub>, 21% O<sub>2sub>, and 69% N<sub>2sub>. We observed that the CO<sub>2sub> tolerance of the hybrid cathode outperforms the pure SCT15 cathode by over 5 times at 550 °C. This significant enhancement is likely attributable to the low CO<sub>2sub> adsorption and reactivity of the SDC protective layer, which are demonstrated through thermogravimetric analysis, energy-dispersive spectroscopy, and electrical conductivity study.