电解质表面微结构对固体氧化物燃料电池的阴极极化电阻的影响

doi:10.15541/jim20140160

无机材料学报 ›› 2014, Vol. 29 ›› Issue (12): 1253-1256.DOI: 10.15541/jim20140160

电解质表面微结构对固体氧化物燃料电池的阴极极化电阻的影响

宋书祥, 王云龙, 夏长荣

(中国科学技术大学材料科学与工程系&苏州纳米科技协同创新中心, 中国科学院能量转化重点实验室, 合肥230026)

收稿日期:2014-03-31 修回日期:2014-05-14 出版日期:2014-12-20 网络出版日期:2014-11-20
作者简介:宋书祥(1989–), 男, 硕士研究生. E-mail:ssx2007@mail.ustc.edu.cn
基金资助:
科技部973项目(2012CB215403);国家自然科学基金(51372239)

Effect of Electrolyte Surface Microstructure on Interfacial Polarization Resistances of Solid Oxide Fuel Cell Cathodes

SONG Shu-Xiang, WANG Yun-Long, XIA Chang-Rong

(CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China)

Received:2014-03-31 Revised:2014-05-14 Published:2014-12-20 Online:2014-11-20
About author:SONG Shu-Xiang. E-mail:ssx2007@mail.ustc.edu.cn
Supported by:
Ministry of Science and Technology Project 973 (2012CB215403);National Natural Science Foundation of China (51372239)

摘要/Abstract

摘要：

在固体氧化物燃料电池(SOFC)中, 电解质对阴极界面极化电阻(R_c)有着显著影响。通过测量以Sm_0.2Ce_0.8O_2-_δ (SDC)为电解质、(La_0.85Sr_0.15)_0.9MnO_3-_δ(LSM)和La_0.6Sr_0.4Fe_0.8Co_0.2O_3-_δ(LSCF)为阴极的对称电池的交流阻抗谱, 研究SDC电解质表面微结构(晶粒大小和晶界长度)对R_c的影响。通过改变烧结温度和时间, 制备出具有不同晶粒尺寸和晶界密度的电解质。通过SEM得到微结构参数, 建立R_c与这些参数的联系。结果发现, 随着晶粒尺寸的减小、晶界密度的增加, R_c明显降低。此外, 对于LSM电极, 晶界密度的增加, 促进了阴极反应的氧离子传导。

关键词: 阴极, 极化阻抗, 晶界密度, 电解质微结构, 固体氧化物燃料电池

Abstract:

The interfacial polarization resistance (R_c) associated with cathode in solid oxide fuel cell (SOFC) is affected by the electrolyte conductivity. In this work, the effect of electrolyte surface microstructure on the cathode performance was demonstrated by analyzing electrochemical impedance spectra of symmetric cells which consist of porous (La_0.85Sr_0.15)_0.9MnO_3-_δ (LSM) and La_0.6Sr_0.4Fe_0.8Co_0.2O_3-_δ (LSCF) electrodes with Sm_0.2Ce_0.8O_2-_δ (SDC) electrolytes. The SDC electrolytes exhibited different surface microstructures, i.e. different grain sizes and grain boundary densities as a result of various sintering conditions. SEM was used to investigate the SDC surface microstructure parameters and the relationships between these parameters and the polarization resistance ware discussed. It is found that R_cis greatly affected by the SDC surface microstructures and decreases with the decrease of grain size, or the increase of grain-boundary density. Moreover, it is demonstrated that the oxygen ion transfer is significantly increased by decreasing grain size for the oxygen reduction at the LSM cathode.

Key words: cathode, interfacial polarization resistance, grain-boundary density, electrolyte microstructure, solidoxide fuel cell

中图分类号:

TQ174

宋书祥, 王云龙, 夏长荣. 电解质表面微结构对固体氧化物燃料电池的阴极极化电阻的影响[J]. 无机材料学报, 2014, 29(12): 1253-1256.

SONG Shu-Xiang, WANG Yun-Long, XIA Chang-Rong. Effect of Electrolyte Surface Microstructure on Interfacial Polarization Resistances of Solid Oxide Fuel Cell Cathodes[J]. Journal of Inorganic Materials, 2014, 29(12): 1253-1256.

图/表 5

图 1 不同烧结条件获得的SDC电解质表面的SEM照片

Fig. 1 Surface morphologies of SDC electrolytes sintered under different conditions (a) 1350℃/5 h; (b) 1450℃/5 h; (c)1550℃/5 h; (d)1550℃/15 h

表1 不同烧结条件下的SDC电解质的晶粒尺寸、晶界密度和电导率(750℃)

Table 1 Average grain size, grain-boundary density, conductivity at 750℃ for SDC electrolytes sintered at different conditions

Sintering condition	1350℃/5 h	1450℃/5 h	1550℃/5 h	1550℃/15 h
Conductivity/ (S?cm^-1)	0.0380	0.0355	0.0348	0.0305
Grain size/μm	0.83	1.51	4.89	7.49
Grain-boundary density/μm^-1	1.20	0.66	0.23	0.18

图 2 单相LSM作为电极, SDC为电解质的对称电池的电化学性能

Fig. 2 Electro-performance of the symmetrical cells with single phase LSM as the electrodes (a) Impedance spectrum measured at 750℃; (b) Equivalent circuit used to fit the impedance

图 3 单相LSM的界面极化电阻与晶粒尺寸的关系

Fig. 3 Interfacial polarization resistances versus grain size (a) Resistance at various temperatures; (b) Resistance at 750℃ for the high and low frequency arcs

图 4 单相LSCF作为阴极, SDC为电解质的对称电池的电化学性能

Fig. 4 Electro-performance of symmetrical cells with single phase LSCF as the electrodes (a-b) Impedance spectra at 750℃ for SDC sintered at different conditions and (c) Rc versus grain size of SDC

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电解质表面微结构对固体氧化物燃料电池的阴极极化电阻的影响

Effect of Electrolyte Surface Microstructure on Interfacial Polarization Resistances of Solid Oxide Fuel Cell Cathodes

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