NiMn2O4尖晶石氧化物阴极的制备及电化学性能研究  

Preparation and electrochemical properties of NiMn2O4 spinel oxide cathode

作　　者：肖扬 徐春明 杨晓霞 张立红 孙旺 乔金硕 王振华 孙克宁 XIAO Yang;XU Chunming;YANG Xiaoxia;ZHANG Lihong;SUN Wang;QIAO Jinshuo;WANG Zhenhua;SUN Kening(School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Key Laboratory of Chemical Power and Green Catalysis,Beijing 100081,China)

机构地区：[1]北京理工大学化学与化工学院,北京100081 [2]化学电源与绿色催化北京市重点实验室,北京100081

出　　处：《化工学报》2020年第9期4292-4302,共11页CIESC Journal

基　　金：国家自然科学基金项目(21506012)。

摘　　要：高性能阴极材料的开发对推动中温固体氧化物燃料电池(intermediate temperature solid oxide fuel cells,IT-SOFCs)的发展具有重要意义。本文采用溶胶-凝胶法制备了尖晶石型NiMn2O4(NMO)电子-离子混合导体材料,并作为IT-SOFCs阴极进行了系统的研究,通过X射线衍射表征确定NMO材料呈稳定的立方相结构,并采用电导弛豫方法对其氧离子传导能力进行了研究。发现NMO具有优秀的氧离子传导能力,为其电化学性能提供了保障。对称电池的电化学阻抗谱测试结果表明,800℃时NMO阴极材料的界面电阻值为0.27Ω·cm^-2,同时作为阳极支撑型SOFC的阴极材料进行放电时的最大功率密度可以达到864.9 mW·cm^-2。上述结果表明,NiMn2O4是一种极具潜力的IT-SOFCs阴极材料。Developing high-performance cathode materials is of great significance to promote the development of intermediate temperature solid oxide fuel cells(IT-SOFCs).In this paper,the spinel-type NiMn2O4(NMO)electronion mixed conductor material was prepared by the sol-gel method,and it was systematically studied as the cathode of IT-SOFCs.It is found that NMO material has stable cubic phase structure by using X-ray diffraction(XRD)and the conductivity of oxygen ions is studied by the technique of electrical conductivity relaxation(ECR).It shows that NMO has excellent oxygen-ion conductivity,which provides guarantee for its electrochemical performance.Impedance spectroscopy measurements of a symmetrical cell shows a low interface impedance,which is only 0.27Ω·cm^-2 at 800℃.At the same time,an anode-supported SOFC with NMO cathode presents a maximum power density of 864.9 mW·cm^-2 at 800℃.The above results demonstrate that NiMn2O4 is a potential cathode material for IT-SOFCs.

关 键 词：电化学 燃料电池 催化 阴极材料 氧还原 尖晶石 

分 类 号：TQ152[化学工程—电化学工业]