基于Pr_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(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_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ) Electrodes

作　　者：杨洋[1,2] 田冬[2] 丁岩芝[2] 卢肖永[2] 林彬[2] 陈永红[2] YANG Yang TIAN Dong DING Yan-Zhi LU Xiao-Yong LIN Bin CHEN Yong-Hong(School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China Key Laboratory of Low Temperature Co-fired Materials,School of Chemical and Materials Engineering, Huainan Normal University, Huainan 232038, China)

机构地区：[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

出　　处：《无机材料学报》2017年第3期235-240,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51102107;51202080);安徽省自然科学基金(1408085MKL43)~~

摘　　要：采用柠檬酸-硝酸盐自蔓延燃烧法分别合成了Pr_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(PSCF)和Gd_(0.2)Ce_(0.8)O_(2-δ)(GDC)粉体,高温固相法合成La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(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?·cm^2下降到0.314?·cm^2;以加湿H_2(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 m W/cm2增大至463 m W/cm^2。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。Pr0.6Sr0.4Co0.2Fe0.8O3-δ （PSCF） and Gd0.2Ce0.8O2-δ （GDC） powders were synthesized by a citric acid- ni- trates self-propagating combustion method, and Lao.gSro.lGao.sMgo.zO3.a （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 sys- tem, 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%H20） 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.

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 

分 类 号：TQ174[化学工程—陶瓷工业]