中温固体氧化物燃料电池Sr1-xTbxCoO3-δ(x≤0.3)阴极材料的制备与性能研究

doi:10.3724/SP.J.1077.2013.12057

无机材料学报 ›› 2013, Vol. 28 ›› Issue (2): 212-216.DOI: 10.3724/SP.J.1077.2013.12057 CSTR: 32189.14.SP.J.1077.2013.12057

中温固体氧化物燃料电池Sr_1-_xTb_xCoO_3-_δ(x≤0.3)阴极材料的制备与性能研究

刘涛

(东北大学材料与冶金学院, 沈阳 110004)

收稿日期:2012-01-08 修回日期:2012-03-16 出版日期:2013-02-10 网络出版日期:2013-01-23
基金资助:
国家自然科学基金(50904016);中央高校基本科研业务费专项基金(N110402011);感谢美国德州大学奥斯汀分校的John B Goodenough教授的帮助与指导。感谢美国能源部洛斯阿拉莫斯国家实验室韩建涛和Sven C Vogel对本文ND测试和数据分析所做的工作。

Preparation and Characterization of Sr_1-_xTb_xCoO_3-_δ (x≤0.3) Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cell

LIU Tao

(School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China)

Received:2012-01-08 Revised:2012-03-16 Published:2013-02-10 Online:2013-01-23
Supported by:
National Natural Science Foundation of China (50904016);Fundamental Research Funds for the Central Universities (N110402011)

摘要/Abstract

摘要：

以化学计量比的SrCO₃、Co₃O₄和Tb₄O₇为原料, 采用固相法合成了中温固体氧化物燃料电池阴极材料Sr_1-_xTb_xCoO_3-_δ(STC, x≤0.3), 采用XRD、ND、TGA、范德堡直流四探针法和电化学方法对STC的晶体结构、高温失重、电导率、极化电阻以及电池进行了研究。结果表明: Sr_0.9Tb_0.1CoO_3-_δ的晶体结构是立方相Pm-3m空间群结构; Sr_0.8Tb_0.2CoO_3-_δ和Sr_0.7Tb_0.3CoO_3-_δ是四方相I4/mmm结构。在500~800℃时, STC的总电导率(σ)均大于407 S/cm。极化电阻(R_p)和活化能(E_a)随着x的增加而增大。当x=0.1时, STC的氧离子空位浓度最大, 具有最好的阴极性能, 由其组成的单电池最大功率密度为836 mW/cm²。

关键词: 固体氧化物燃料电池, 阴极, 钴基钙钛矿, 极化电阻

Abstract:

Cathode materials consisting of Sr_1-_xTb_xCoO_3-_δ (STC, x≤0.3) were prepared by solid-state reaction from stoichiometric proportions of SrCO₃, Co₃O₄ and Tb₄O₇. Crystal structure, weight loss processes, electronic conductivity, polarization resistance and cell performance were investigated by XRD, ND, TGA, Van Der Pauw DC four-probe method and electrochemical method, respectively. XRD shows the presence of two structural phases in the series belonging to Pm-3m for Sr_0.9Tb_0.1CoO_3-_δ and I4/mmm for Sr_0.8Tb_0.2CoO_3-_δ and Sr_0.7Tb_0.3CoO_3-_δ. Electronic conductivity measurements show that the conductivities of STC were all higher than 407 S/cm in the temperature range of 500℃ to 800℃. AC impedance measurements in symmetrical cells with LSGM as an electrolyte show that the polarization resistance (R_p) and the activation energy (E_a) increase with increasing Tb content. Sr_0.9Tb_0.1CoO_3-_δ, with the largest concentration of oxygen vacancies exhibits the best cathode characteristics with maximum power density of 836 mW/cm².

Key words: solid oxide fuel cell, cathode, cobaltate perovskites, polarization resistance

中图分类号:

O614

刘涛. 中温固体氧化物燃料电池Sr_1-_xTb_xCoO_3-_δ(x≤0.3)阴极材料的制备与性能研究[J]. 无机材料学报, 2013, 28(2): 212-216.

LIU Tao. Preparation and Characterization of Sr_1-_xTb_xCoO_3-_δ (x≤0.3) Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cell[J]. Journal of Inorganic Materials, 2013, 28(2): 212-216.

图/表 6

图1 STC粉末的XRD图谱及Rietveld拟合结果

Fig. 1 XRD patterns of STC and the Rietveld refinement

图2 空气中STC的TGA曲线

Fig. 2 TGA curves of STC recorded in air

图3 STC的电导率与温度之间的关系

Fig. 3 Temperature dependence of the electronic conductivity for STC

图4 对称电池STC|LSGM|STC在800℃下的阻抗谱图

Fig. 4 The impedance spectra of the symmetrical cell with the configuration of STC|LSGM|STC at 800℃

图5 由阻抗谱图得到的极化电阻与温度之间的关系

Fig. 5 The polarization resistance obtained from impedance spectra at different temperatures

图6 单电池STC|LSGM|Ni-GDC在800℃下的输出性能曲线

Fig. 6 Electrochemical performance data of STC|LSGM|Ni- GDC at 800℃

参考文献 14

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中温固体氧化物燃料电池Sr_1-_xTb_xCoO_3-_δ(x≤0.3)阴极材料的制备与性能研究

Preparation and Characterization of Sr_1-_xTb_xCoO_3-_δ (x≤0.3) Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cell

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