基于Pr0.6Sr0.4Co0.2Fe0.8O3-δ对称固体氧化物燃料电池的性能优化研究

doi:10.15541/jim20160340

无机材料学报 ›› 2017, Vol. 32 ›› Issue (3): 235-240.DOI: 10.15541/jim20160340

基于Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δ对称固体氧化物燃料电池的性能优化研究

杨洋^1,2, 田冬², 丁岩芝², 卢肖永², 林彬², 陈永红²

(1. 安徽理工大学化学工程学院, 淮南232001; 2. 淮南师范学院淮南低温共烧材料安徽省重点实验室, 淮南232038)

收稿日期:2016-05-25 修回日期:2016-07-30 出版日期:2017-03-20 网络出版日期:2017-02-24
作者简介:杨洋(1992–), 男, 硕士研究生. E-mail: yangbegl@163.com
基金资助:
国家自然科学基金(51102107, 51202080);安徽省自然科学基金(1408085MKL43)

Improved Performance of Symmetrical Solid Oxide Fuel Cells with Redox-reversible Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δElectrodes

YANG Yang^1,2, TIAN Dong², DING Yan-Zhi², LU Xiao-Yong², LIN Bin², CHEN Yong-Hong²

(1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China; 2. Key Laboratory of Low Temperature Co-fired Materials; School of Chemical and Materials Engineering, Huainan Normal University, Huainan 232038, China)

Received:2016-05-25 Revised:2016-07-30 Published:2017-03-20 Online:2017-02-24
About author:YANG Yang. E-mail: yangbegl@163.com
Supported by:
National Natural Science Foundation of China (51102107, 51202080);Anhui Provincial Natural Science Foundation (1408085MKL43)

摘要/Abstract

摘要：

采用柠檬酸-硝酸盐自蔓延燃烧法分别合成了Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δ(PSCF)和Gd_0.2Ce_0.8O_2-_δ(GDC)粉体, 高温固相法合成La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ(LSGM)电解质粉体。以LSGM为电解质, PSCF同时作为阴极和阳极, GDC作为功能层材料, 构建了对称固体氧化物燃料电池PSCF│GDC│LSGM│GDC│PSCF。利用X射线衍射法研究材料的成相以及相互间的化学稳定性, 交流阻抗法记录界面极化行为, 用扫描电子显微镜观察电池的断面微结构, 用自组装的测试系统评价电池输出性能。结果表明, 合成的PSCF粉体呈立方钙钛矿结构, 具有良好的氧化-还原可逆性。使用GDC功能层明显改善了氢气环境下PSCF与LSGM材料间的化学相容性以及电池的输出性能, 800℃时, 电极│电解质界面极化电阻从6.892 Ω·cm²下降到0.314 Ω·cm²; 以加湿H₂(含体积分数3%的水蒸气)为燃料气, 空气为氧化气时, 单电池输出功率密度由269 mW/cm²增大至463 mW/cm²。研究结果显示, PSCF是对称固体氧化物燃料电池良好的候选电极材料, GDC功能层对改善电池长期稳定性能具有潜在的应用价值。

关键词: 对称固体氧化物燃料电池, 氧化-还原可逆性, Pr0.6Sr0.4Co0.2Fe0.8O3-δ, GDC功能层

Abstract:

Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δ (PSCF) and Gd_0.2Ce_0.8O_2-_δ (GDC) powders were synthesized by a citric acid- nitrates self-propagating combustion method, and La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ (LSGM) electrolyte powder was prepared by conventional solid state reaction process. The LSGM-supported symmetrical solid oxide fuel cell of PSCF│GDC│LSGM│GDC│PSCF with GDC function layer was fabricated. The phase structure, chemical compatibility, polarization resistance, cross-section microstructure and the cell performance were investigated by X-ray diffraction (XRD), electrochemical impedance spectra, scanning electron microscope (SEM) and self-assembly SOFC test system, respectively. The results indicate that PSCF powder exhibits a single perovskite with cubic symmetry and a good redox reversibility. The GDC function layer dramatically improve the chemical compatibility among PSCF, LSGM in hydrogen and the cell performance. The area specific resistance (ASR) of PSCF│GDC decreased from 6.892 Ω·cm² to 0.314 Ω·cm² in hydrogen at 800℃ and the maximum power density increased from 269 mW/cm² to 463 mW/cm² using humidified hydrogen (3%H₂O) as fuel and ambient air as oxidant. The results indicate that PSCF is a promising electrode material for symmetrical solid oxide fuel cells, and GDC function layer is a potential way to enhance the long-term stability.

Key words: symmetrical solid oxide fuel cell, redox reversibility, Pr0.6Sr0.4Co0.2Fe0.8O3-δ, GDC function layer

中图分类号:

TQ174

杨洋, 田冬, 丁岩芝, 卢肖永, 林彬, 陈永红. 基于Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δ对称固体氧化物燃料电池的性能优化研究[J]. 无机材料学报, 2017, 32(3): 235-240.

YANG Yang, TIAN Dong, DING Yan-Zhi, LU Xiao-Yong, LIN Bin, CHEN Yong-Hong. Improved Performance of Symmetrical Solid Oxide Fuel Cells with Redox-reversible Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δElectrodes[J]. Journal of Inorganic Materials, 2017, 32(3): 235-240.

图/表 7

图1 PSCF经1000℃下煅烧3 h(a), PSCF再经800℃下还原10 h(b)和再在800℃空气环境中煅烧3 h的XRD图谱(c)

Fig. 1 XRD patterns of PSCF calcined at 1000℃ for 3 h in air (a), reduced at 800℃ for 10 h in humidified H2 (b) and calcined at 800℃ for 3 h in air (c)

图2 在不同气氛下煅烧10 h的PSCF与LSGM、GDC混合粉体的XRD图谱

Fig. 2 XRD patterns of PSCF with LSGM and GDC mixtures calcined for 10 h in different atmospheres (a) 1000℃ in air; (b) 800℃ in H2

图3 对称电池在不同气氛中的阻抗谱

Fig. 3 Impedance spectra of SSOFC (a) PSCF│LSGM│PSCF in air; (b) PSCF│GDC│LSGM│GDC│PSCF in air; (c) PSCF│LSGM│PSCF in H2 and (d) PSCF│GDC│LSGM│GDC│PSCF in H2

图4 界面极化阻抗Rp与温度的关系

Fig. 4 Interfacial polarization resistance (Rp) obtained under open-circuit condition at different temperatures

图5 (a)PSCF│LSGM│PSCF和(b)PSCF│GDC│LSGM│GDC│PSCF的单电池的输出性能

Fig. 5 Electrochemical performance of single cell for (a) PSCF│LSGM│PSCF and (b) PSCF│GDC│LSGM│GDC│PSCF

图6 (a)PSCF│LSGM│PSCF和(b)PSCF│GDC│LSGM│GDC│PSCF单电池的电化学阻抗谱

Fig. 6 Electrochemical impedance spectra of single cells for (a) PSCF│LSGM│PSCF and (b) PSCF│GDC│LSGM│GDC│PSCF under operating condition

图7 输出性能测试后(a)PSCF│LSGM│PSCF和(b)PSCF│GDC│LSGM│GDC│PSCF电池断面SEM照片

Fig. 7 Cross-sectional SEM images of (a) PSCF│LSGM│PSCF and (b) PSCF│GDC│LSGM│GDC│PSCF after testing

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基于Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δ对称固体氧化物燃料电池的性能优化研究

Improved Performance of Symmetrical Solid Oxide Fuel Cells with Redox-reversible Pr_0.6Sr_0.4Co_0.2Fe_0.8O_3-_δElectrodes

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