用负热膨胀氧化物Sm_(0.85)Zn_(0.15)MnO_(3)复合La_(0.6)Sr_(0.4)CoO_(3)–δ材料制备中温固体氧化物燃料电池空气极  

Negative Thermal Expansion Oxide Sm_(0.85)Zn_(0.15)Mno_(3)Composite of La_(0.6)Sr_(0.4)CoO_(3-δ)Materials as Intermediate Temperature Solid Oxide Fuel Cells High-Performance Air Electrode

作　　者：司宇 高铭泽 李世清 官万兵 杨钧 王建新 SI Yu;GAO Mingze;LI Shiqing;GUAN Wanbing;YANG Jun;WANG Jianxin(College of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,Zhejiang,China;Zhejiang Provincial Key Laboratory of Advanced Fuel Cell and Electrolyzer Technology,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,Zhejiang,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所,浙江省先进燃料电池与电解池技术重点实验室,浙江宁波315201

出　　处：《硅酸盐学报》2024年第12期3772-3780,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(22209191,11932005,U20A20251)。

摘　　要：La_(0.6)Sr_(0.4)CoO_(3)–δ(LSC)材料是现在固体氧化物燃料电池(SOFC)空气极材料的主流研究方向之一,有着极佳的电化学性能,而其最大的短处就是热膨胀系数过大。负热膨胀材料因为特定温度区间内会呈现出热收缩的特性而被命名,复合后在理论上可以显著降低材料的热膨胀系数,更容易使SOFC空气极材料与电解质材料实现热匹配。本工作以LSC材料为基体,选择负热膨胀特性较为突出的Sm_(0.85)Zn_(0.15)Mn O_(3)(SZM)材料作为复合相,研究了复合料的电化学性能。通过固–液复合法合成了负热膨胀(NTE)氧化物SZM,将之与La_(0.6)Sr_(0.4)CoO_(3)–δ(LSC)机械混合形成LSC–x SZM(x=0~40%)系列复合空气极材料。XRD结果显示SZM与LSC二者化学相容性良好。热膨胀测试表明,SZM有着优秀的热补偿能力,x=30%时,复合材料在室温至800℃的平均热膨胀系数为13×10^(–6)K^(–1),与阻隔层材料相近。LSC–30%SZM复合材料在800~550℃的面比电阻由LSC的0.012~1.240Ω·cm^(2)降至0.008~0.620Ω·cm^(2),展现良好的界面接触。纽扣电池在750℃的功率密度为1702 mW·cm^(–2),而同温的纯相LSC为1209 mW·cm^(–2),实现41%的提升;同步的极化电阻Rp由0.65Ω·cm^(2)降至0.50Ω·cm^(2)。热循环和恒流放电的电压降幅均在1%以下,测试后的电池截面SEM照片均未发生分层现象。由于复合材料良好的热匹配,界面接触更好,最终实现电池的功率密度和稳定性的同时提升。Introduction Solid oxide fuel cell(SOFC)is one of the strong competitors of energy technology.SOFC has the characteristics of wide fuel selection,less pollution emission,high safety,and low noise as an excellent energy conversion and utilization device.However,the existing commercial SOFC still has some problems like high working temperature and large attenuation rate due to the limitation of material performance,restricting the application.Among the components of SOFC,the performance of air pole material is a key factor affecting SOFC.LSC material is one of the main research directions of solid oxide fuel cells(SOFC)air polar materials with the superior electrochemical properties,but its major disadvantage is a great thermal expansion coefficient(TEC).The negative thermal expansion(NTE)material provides an effective way to reduce the TEC of the SOFC air pole material.NTE material is named because of the characteristics of thermal contraction in the specific temperature interval.Theoretically,it can reduce the TEC of composite material and facilitate the thermal match between SOFC air electrode material and electrolyte material.Some NTE materials are a perovskite structure with a higher conductivity than Gd_(0.2)Ce_(0.8)O_(2–δ)(GDC)of fluorite structure.These advantages make the theoretical cell power density of NTE composite air electrode material above the GDC composite cathode In this paper,La_(0.6)Sr_(0.4)CoO_(3–δ)(LSC)material was used as a matrix,Sm_(0.85)Zn_(0.15)MnO_(3)(SZM)material with the superior negative thermal expansion characteristics was selected as a composite phase,and a series of LS–x SZM(x=0–40%)materials were designed to achieve the thermal matching of composite materials.Methods LSC and SZM powders were synthesized by a solid–liquid composite method.First,the corresponding quality of acetate raw materials was accurately weighed according to the stoichiometric ratio,and then the appropriate citric acid(CA)was weighed as a complexing agent according to the total metal particle wei

关 键 词：固体氧化物燃料电池 空气极 负热膨胀 材料复合 稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程]