Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Ce0.9Gd0.1O2-δ中低温固体氧化物燃料电池复相阴极的研究

doi:10.15541/jim20170232

无机材料学报 ›› 2018, Vol. 33 ›› Issue (4): 441-446.DOI: 10.15541/jim20170232 CSTR: 32189.14.10.15541/jim20170232

Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ-Ce_0.9Gd_0.1O_2-_δ中低温固体氧化物燃料电池复相阴极的研究

罗凌虹, 胡佳幸, 程亮, 徐序, 吴也凡, 林囿辰

景德镇陶瓷大学江西省燃料电池材料与器件重点实验室, 景德镇 333403

收稿日期:2017-05-09 修回日期:2017-07-07 出版日期:2018-04-30 网络出版日期:2018-03-27
作者简介:罗凌虹(1966-), 女, 教授. E-mail: luolinghong@tsinghua.org.cn
基金资助:
国家自然科学基金(51662015, 51462011);江西省教育厅科技落地计划(KJLD13072);研究生创新专项基金(YC2016-S378)

Performance of the Composite Cathode Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ-Ce_0.9Gd_0.1O_2-_δ for Medium-low Temperature Solid Oxide Fuel Cell

LUO Ling-Hong, HU Jia-Xing, CHENG Liang, XU Xu, WU Ye-Fan, LIN You-Chen

Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

Received:2017-05-09 Revised:2017-07-07 Published:2018-04-30 Online:2018-03-27
About author:LUO Ling-Hong. E-mail: luolinghong@tsinghua.org.cn
Supported by:
National Natural Science Foundation of China (51662015, 51462011);Project of Jiangxi Provincial Department of Science and Technology (KJLD13072);Innovation Program of Graduate Students in Jiangxi Province (YC2016-S378)

摘要/Abstract

摘要：

采用溶胶-凝胶法制备Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ(BSCF)粉体后, 使用Ce_0.9Gd_0.1O_2-_δ(GDC)溶胶包裹BSCF粉的方法制备疏松多孔的BSCF-xGDC(x=30wt%, 40wt%, 50wt%)复相阴极。通过X射线衍射仪、场发射扫描电镜和透射电镜对复相阴极的物相组成、单电池断面形貌及GDC对BSCF颗粒的包裹形貌进行表征。利用阻抗谱测试研究了复相阴极材料的电化学性能, 讨论了掺入GDC量对阴极性能的影响。结果表明：通过GDC溶胶包裹BSCF粉体的制备方法改善了阴极的电化学性能, 在同一温度下, BSCF-40GDC阴极的极化电阻最小, 在650℃时阴极极化阻抗约为0.397 Ω•cm²; 以BSCF-40GDC为阴极制备的单电池, 以H₂+3%H₂O为燃料气、空气为氧化气体, 650℃下电池的最大功率密度为0.514 W/cm², 欧姆电阻为0.257 Ω•cm², 两极极化电阻为0.0588 Ω•cm²。

关键词: SOFC, 复相阴极材料, BSCF-GDC, 电化学性能

Abstract:

Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ(BSCF) powder was prepared via Sol-Gel method. Porous BSCF-xGDC(x= 30wt%, 40wt%, 50wt%) composite cathodes were prepared via wrapping BSCF powders with Ce_0.9Gd_0.1O_2-_δ (GDC) sol. The phase composition of the composite cathodes, the morphology of the cross section of the cell, as well as the BSCF particles coated with GDC were characterized with X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy, respectively. The electrochemical performances of the composite cathodes were studied by impedance spectroscopy. The effects of the amount of GDC on the electrochemical performance of the composite cathode were studied by impedance spectroscopy. All results showed that the electrochemical performance of the composite cathode greatly improved. Electrode polarization resistance of the BSCF-40GDC was the minimum, with the value of 0.397 Ω•cm² at 650℃. The maximum power density of the single cell was 0.514 W/cm²with the values of Ohmic resistance at 0.257 Ω•cm² and the polarization resistance at 0.0588 Ω•cm², by using H₂+3%H₂O as fuel and air as oxidizing gas at 650℃.

Key words: SOFC, composite cathode materials, BSCF-GDC, electrochemical performance

中图分类号:

TQ174

罗凌虹, 胡佳幸, 程亮, 徐序, 吴也凡, 林囿辰. Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ-Ce_0.9Gd_0.1O_2-_δ中低温固体氧化物燃料电池复相阴极的研究[J]. 无机材料学报, 2018, 33(4): 441-446.

LUO Ling-Hong, HU Jia-Xing, CHENG Liang, XU Xu, WU Ye-Fan, LIN You-Chen. Performance of the Composite Cathode Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ-Ce_0.9Gd_0.1O_2-_δ for Medium-low Temperature Solid Oxide Fuel Cell[J]. Journal of Inorganic Materials, 2018, 33(4): 441-446.

图/表 10

图1 不同温度煅烧的BSCF-40GDC阴极粉体的XRD图谱

Fig. 1 XRD patterns of BSCF-40GDC cathode powder calcined at different temperatures

图2 GDC包裹BSCF颗粒的TEM照片

Fig. 2 TEM images of BSCF particles coated by GDC

图3 BSCF-xGDC复相阴极在650℃极化阻抗图

Fig. 3 Impedance spectra for BSCF-xGDC cathode measured at 650℃

表1 BSCF-xGDC复相阴极在650℃测试的阻抗拟合结果

Table 1 Impendance spectra fitting results of the BSCF-xGDC cathode measured at 650℃

Sample	R/(Ω•cm²)
Sample	R₁	R₂	R₃	R_el=(R₂+R₃)/2
BSCF-30GDC	15.24	0.595	0.338	0.466
BSCF-40GDC	12.10	0.494	0.301	0.397
BSCF-50GDC	16.31	1.463	0.305	0.884

图4 BSCF-GDC样品的Arrhenius图(测试温度在550℃~ 750℃)

Fig. 4 Arrhenius plots of resistance of BSCF-GDC compoistes measured at temperature from 550℃ to 750℃

图5 BSCF-40GDC单电池的断面SEM照片

Fig. 5 SEM images of the fracture section for the single-cell with BSCF-40GDC cathode(a) Cross section of whole cell; (b) Cross section of the cathode

图6 不同比例的BSCF-GDC单电池在650℃下的I-P、I-V曲线

Fig. 6 I-V and I-P characteristics of the cells for different ratios of BSCF-GDC at 650℃

图7 电池BSCF-40GDC|GDC|NiO-GDC在不同温度下的I-P、I-V曲线 2.6 单电池的电阻抗性能

Fig. 7 I-V and I-P curves of BSCF-40GDC|GDC|NiO-GDC single cell at different operation temperatures

图8 不同比例的BSCF-GDC单电池在650℃测试的单电池阻抗谱图

Fig. 8 Impedance spectra of the single cell for different ratios of BSCF-GDC tested at 650℃

图9 不同运行温度下BSCF-40GDC|GDC|NiO-GDC单电池的阻抗谱图 3 结论

Fig. 9 Impedance spectra of BSCF-40GDC|GDC|NiO-GDC single cell at different operation temperature

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Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ-Ce_0.9Gd_0.1O_2-_δ中低温固体氧化物燃料电池复相阴极的研究

Performance of the Composite Cathode Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-_δ-Ce_0.9Gd_0.1O_2-_δ for Medium-low Temperature Solid Oxide Fuel Cell

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