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Synthesis and characterization of Sr2Fe1.4Ni0.1Mo0.5-xNbxO6-δ (x = 0, 0.05, 0.1, and 0.15) cathodes for solid oxide fuel cells

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Abstract

Nb modified Sr2Fe1.4Ni0.1Mo0.5-xNbxO6-δ (SFNi0.1MNbx, x = 0, 0.05, 0.1, and 0.15) materials are synthesized by the one-step combustion method, and their characteristics are investigated. According to the X-ray diffraction (XRD), all samples present single perovskite structures and scanning electron microscope (SEM) results indicate that all samples possess uniform porous structures. Additionally, the electrode conductivity is improved by doping Nb on the B′ site of SFNi0.1M. From the X-ray photoelectron spectroscopy (XPS) results, the ratios of Fe2+/Fe3+ and Mo6+/Mo5+ vary with the Nb content, which leads to the conductivity change of SFNi0.1MNbx materials. For all the samples, SFNi0.1MNb0.05 exhibits the best electrochemical performance with the lowest polarization resistance of 0.11 Ω cm2 and the highest power density of 1260 mW cm−2 800 °C in humidified H2. The results indicate that SFNi0.1MNbx is a promising type of candidate cathode for solid oxide fuel cells.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (21006015, 21376001, 21506012, 20156028) and the Beijing Higher Education Young Elite Teacher Project (YETP1205).

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Authors and Affiliations

  1. Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing, 100081, China

    Jinshuo Qiao, Wenyi Wang, Jie Feng, Wenjun Chen, Minjie He, Zhenhua Wang, Wang Sun & Kening Sun

  2. Collaborative Innovation Center of Electric Vehicles in Beijing, No.5 Zhongguancun South Avenue, Haidian District, Beijing, 100081, People’s Republic of China

    Zhenhua Wang & Kening Sun

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  1. Jinshuo Qiao
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  2. Wenyi Wang
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Correspondence to Kening Sun.

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Qiao, J., Wang, W., Feng, J. et al. Synthesis and characterization of Sr2Fe1.4Ni0.1Mo0.5-xNbxO6-δ (x = 0, 0.05, 0.1, and 0.15) cathodes for solid oxide fuel cells. Ionics 24, 421–428 (2018). https://doi.org/10.1007/s11581-017-2203-x

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  • DOI: https://doi.org/10.1007/s11581-017-2203-x

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