CIESC Journal ›› 2020, Vol. 71 ›› Issue (9): 4292-4302.DOI: 10.11949/0438-1157.20200532

• Energy and environmental engineering • Previous Articles     Next Articles

Preparation and electrochemical properties of NiMn2O4 spinel oxide cathode

Yang XIAO1(),Chunming XU1,Xiaoxia YANG1,Lihong ZHANG1,Wang SUN1,2(),Jinshuo QIAO1,2,Zhenhua WANG1,2,Kening SUN1,2   

  1. 1.School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
    2.Beijing Key Laboratory of Chemical Power and Green Catalysis, Beijing 100081, China
  • Received:2020-05-08 Revised:2020-08-04 Online:2020-09-05 Published:2020-09-05
  • Contact: Wang SUN

NiMn2O4尖晶石氧化物阴极的制备及电化学性能研究

肖扬1(),徐春明1,杨晓霞1,张立红1,孙旺1,2(),乔金硕1,2,王振华1,2,孙克宁1,2   

  1. 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
  • 通讯作者: 孙旺
  • 作者简介:肖扬(1996—),男,硕士研究生,16637281276@163.com
  • 基金资助:
    国家自然科学基金项目(21506012)

Abstract:

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) electron-ion 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 0.27 Ω·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.

Key words: electrochemistry, fuel cells, catalysis, cathode, oxygen reduction, spinel

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0.27 Ω·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。

关键词: 电化学, 燃料电池, 催化, 阴极材料, 氧还原, 尖晶石

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