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Suspension Plasma Sprayed Sr2Fe1.4Mo0.6O6−δ Electrodes for Solid Oxide Fuel Cells

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Abstract

In this study, suspension plasma spraying (SPS) was applied to deposit double perovskite Sr2Fe1.4Mo0.6O6−δ (SFM) which can be used as both cathode and anode for solid oxide fuel cells. The effects of SFM concentration on the electrode phase composition, microstructure, and catalytic performance were investigated. The electrodes showed a dense structure when it was deposited at a concentration of 0.05 mol/L. The cathode performance was limited by the limited three-phase boundaries and poor gas diffusion. At 750 °C, cathode polarization (R pc) was 0.19 Ω cm2. When the SFM concentration increased to 0.075 mol/L, the deposits revealed a porous microstructure with well-bonded fine particles. As a result, the Rpc decreased significantly to 0.078 Ω cm2 at 750 °C. However, when the SFM concentration was further increased to 0.1 mol/L, the R pc increased owing to the limited interface bonding between the non-molten particles. As a result, it was found that the SFM suspension concentration should be optimized to achieve a highly active SFM by SPS process. Moreover, when the optimized deposit was employed as an anode and tested in a hydrogen atmosphere, it showed anode polarization resistance (Rpa) of 1.5 Ω cm2 at 750 °C.

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Acknowledgments

This study was partially supported by the National Basic Research Program (Grant No. 2012CB625100) and China Postdoctoral Science Foundation Grant (Grant No. 2015M580840).

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China

    Shan-Lin Zhang, Ai-Ping Zhang, Cheng-Xin Li, Guan-Jun Yang & Chang-Jiu Li

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  1. Shan-Lin Zhang
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  2. Ai-Ping Zhang
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Correspondence to Cheng-Xin Li.

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Zhang, SL., Zhang, AP., Li, CX. et al. Suspension Plasma Sprayed Sr2Fe1.4Mo0.6O6−δ Electrodes for Solid Oxide Fuel Cells. J Therm Spray Tech 26, 432–440 (2017). https://doi.org/10.1007/s11666-016-0478-5

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  • DOI: https://doi.org/10.1007/s11666-016-0478-5

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