Electrochemical performance of mixed ionic–electronic conducting oxides as anodes for solid oxide fuel cell |
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Authors: | Shizhong Wang Yi Jiang Yahong Zhang Wenzhao Li Jingwang Yan and Zigui Lu |
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Institution: | Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China |
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Abstract: | Mixed ionic–electronic conducting (MIEC) oxides, SrFeCo0.5Ox, SrCo0.8Fe0.2O3−δ and La0.6Sr0.4Fe0.8Co0.2O3−δ have been synthesized and prepared on yttria-stabilized zirconia as anodes for solid oxide fuel cells. Power output measurements show that the anodes composed of such kinds of oxides exhibit modest electrochemical activities to both H2 and CH4 fuels, giving maximum power densities of around 0.1 W/cm2 at 950°C. Polarization and AC impedance measurements found that large activation overpotentials and ohmic resistance drops were the main causes for the relative inferior performance to the Ni-YSZ anode. While interlayered with an Ni-YSZ anode, a significant improvement in the electrochemical performance was observed. In particular, for the SrFeCo0.5Ox oxide interlayered Ni-YSZ anode, the maximum power output reaches 0.25 W/cm2 on CH4, exceeding those of both SrFeCo0.5Ox and the Ni-YSZ, as anodes alone. A synergetic effect of SrFeCo0.5Ox and the Ni-YSZ has been observed. Future work is needed to examine the long-term stability of MIEC oxide electrodes under a very reducing environment. |
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Keywords: | Mixed ionic–electronic conducting oxides Anodes Methane oxidation Solid oxide fuel cell |
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