Synthesis and Characterization of La0.75Sr0.25Mn0.5Cr0.5-xCuxO3-δ for SOFC Anode Material

doi:10.3724/SP.J.1077.2013.12674

Abstract

Abstract: New perovskite oxides La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ (LSMCr_0.5-xCu_x, x=0, 0.05, 0.10, 0.20) were developed as anode materials for solid oxide fuel cells (SOFC). Phase analysis, chemical compatibility with YSZ electrolyte and microstructure of LSMCr_0.5-xCu_x were characterized by X-Ray diffusion (XRD) and transmission electron microscope (TEM), respectively. The total conductivities of LSMCr_0.5-xCu_x in different atmospheres were measured by four-terminal DC method, and the AC electrochemical impedance spectra measurements were carried out using symmetrical cell method. The as-prepared LSMCr_0.5-xCu_x powders are pure rhombohedral perovskite phase confirmed by XRD, and the size of particles increase with increasing Cu content. No third impurity phase is observed when LSMCr_0.5-xCu_x (x=0, 0.05, 0.10) and YSZ are heat-treated in air at 1200℃ for 3 h, indicating good chemical compatibility between the anode materials and YSZ electrolyte. The total conductivity of doped materials increases remarkably with increasing Cu content in air and in 5% H₂-Ar atmosphere. In addition, the impedance spectra show that the ASR (anode surface resistance) value of LSMCr_0.5-xCu_x in wet 5% H₂-Ar atmosphere is lower than that of undoped LSCM and reaches the minimum value (0.38 Ω·cm²) at 900℃ when x is 0.05.

Key words: SOFC, anode, LSCM, Cu substitution, conductivity, resistance

CLC Number:

TM911

SUN Lin, LU Jun, YIN Jie-Wei, YIN Yi-Mei, MA Zi-Feng. Synthesis and Characterization of La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ for SOFC Anode Material[J]. Journal of Inorganic Materials, 2013, 28(9): 925-930.

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Synthesis and Characterization of La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ for SOFC Anode Material

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