新型SOFC阳极材料La0.75Sr0.25Mn0.5Cr0.5-xCuxO3-δ的合成与表征

doi:10.3724/SP.J.1077.2013.12674

无机材料学报 ›› 2013, Vol. 28 ›› Issue (9): 925-930.DOI: 10.3724/SP.J.1077.2013.12674

新型SOFC阳极材料La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ的合成与表征

孙琳, 卢军, 殷洁炜, 尹屹梅, 马紫峰

(上海交通大学化学化工学院, 上海200240)

收稿日期:2012-11-08 修回日期:2013-01-22 出版日期:2013-09-20 网络出版日期:2013-08-14
作者简介:孙琳(1988-), 女, 硕士研究生. E-mail: sunlin19880211@hotmail.com
基金资助:
国家自然科学基金(21173147); 上海市自然科学基金(09ZR1413900)

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

SUN Lin, LU Jun, YIN Jie-Wei, YIN Yi-Mei, MA Zi-Feng

(School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Received:2012-11-08 Revised:2013-01-22 Published:2013-09-20 Online:2013-08-14
About author:SUN Lin. E-mail: sunlin19880211@hotmail.com
Supported by:
National Natural Science Foundation of China (21173147); Natural Science Foundation of Science and Technology Commission of Shanghai Municipality (09ZR1413900)

摘要/Abstract

摘要： 合成了新型固体氧化物燃料电池(SOFC)阳极材料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)。通过X射线衍射(XRD)表征其物相结构和与电解质的化学相容性, 通过透射电子显微镜(TEM)表征其微观形貌。用直流四探针法测试了材料的电导率; 交流阻抗法表征了材料的阳极阻抗特性。结果表明: LSMCr_0.5-xCu_x材料均为菱方钙钛矿晶相, Cu的掺入导致晶胞体积和粉体粒径增大。x≤0.10时, 阳极粉体与YSZ在1200℃烧结3 h无第三相生成, 具有良好的化学相容性。LSMCr_0.5-xCu_x 在空气和5%H₂-Ar气氛下的电导率均随x的增加而增大; 在湿润的5%H₂-Ar气氛下的阳极极化面电阻(ASR)均低于未掺杂的LSCM, x =0.05时ASR最低, 900℃时仅有0.38 Ω·cm²。

关键词: 固体氧化物燃料电池, 阳极, LSCM, Cu掺杂, 电导率, 阻抗

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

中图分类号:

TM911

孙琳, 卢军, 殷洁炜, 尹屹梅, 马紫峰. 新型SOFC阳极材料La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ的合成与表征[J]. 无机材料学报, 2013, 28(9): 925-930.

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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新型SOFC阳极材料La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ的合成与表征

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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新型SOFC阳极材料La0.75Sr0.25Mn0.5Cr0.5-xCuxO3-δ的合成与表征

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

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新型SOFC阳极材料La_0.75Sr_0.25Mn_0.5Cr_0.5-xCu_xO_3-δ的合成与表征

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