储能科学与技术 ›› 2024, Vol. 13 ›› Issue (2): 361-369.doi: 10.19799/j.cnki.2095-4239.2023.0545

• 储能材料与器件 • 上一篇    下一篇

三维孔道NiMn-MOF电极材料制备及电化学性能研究

刘新1,2(), 毛喜玲2,3(), 闫欣雨2,3, 王俊强2,3, 李孟委2,3   

  1. 1.中北大学能源与动力工程学院
    2.中北大学前沿交叉科学研究院
    3.中北大学仪器与电子学院,山西 太原 030051
  • 收稿日期:2023-08-14 修回日期:2023-09-15 出版日期:2024-02-28 发布日期:2024-03-01
  • 通讯作者: 毛喜玲 E-mail:xinlau6688@163.com;xlmao0620@nuc.edu.cn
  • 作者简介:刘新(1998—),男,硕士研究生,主要从事NiMn-MOF及其衍生物电极材料设计与调控研究,E-mail:xinlau6688@163.com
  • 基金资助:
    国家自然科学基金青年基金项目(62004178);山西省基础研究计划(202203021212149)

Preparation and electrochemical properties of NiMn-MOF with 3D pore network electrode materials

Xin LIU1,2(), Xiling MAO2,3(), Xinyu YAN2,3, Junqiang WANG2,3, Mengwei LI2,3   

  1. 1.School of Energy and Power Engineering, North University of China
    2.Academy for Advanced Interdisciplinary Research, North University of China
    3.School of Instrument and Electronics, North University of China, Taiyuan 030051, Shanxi, China
  • Received:2023-08-14 Revised:2023-09-15 Online:2024-02-28 Published:2024-03-01
  • Contact: Xiling MAO E-mail:xinlau6688@163.com;xlmao0620@nuc.edu.cn

摘要:

针对目前超级电容器电极材料能量密度较低、制备工艺复杂的难题,利用MOF材料的高比表面积、多孔结构的优势,本工作采用简单可控的一步水热法制备具有三维孔道网络结构的双金属NiMn-MOF纳米片,Ni与Mn相近的原子半径有利于双金属NiMn-MOF的合成以及暴露出更多的活性位点,通过不断优化工艺参数(水热温度和水热时间),进行对比获得了高比容的NiMn-MOF电极材料。同时借助扫描电子显微技术(SEM)、能谱分析技术(EDS)、X射线衍射技术(XRD)对电极材料的形貌和晶体结构进行详细的表征,利用循环伏安(CV)、恒流充放电(GCD)、交流阻抗(EIS)进行电化学性能分析。在6 mol/L的KOH电解液中进行三电极测试,结果表明当电流密度为0.5 A/g时,其比容量高达1023.5 F/g。以双金属NiMn-MOF为正极,活性炭(AC)为负极组装的非对称超级电容器,在电流密度为0.5 A/g时,其比容量为94.37 F/g,并使用该器件成功点亮红色LED灯,表明所制备的双金属NiMn-MOF纳米片具有良好的电化学性能,为超级电容器电极材料的制备提供了新的思路。

关键词: 镍锰过渡金属有机框架材料, 电极材料, 超级电容器, 电化学性能

Abstract:

Addressing the issue of low energy density and complex preparation process associated with supercapacitor electrode materials, this study capitalizes on the high specific surface area and porous structure of MOF materials. Bimetallic NiMn-MOF nanosheets with a three-dimensional pore network structure were prepared through a simple and controllable one-step hydrothermal method. The close atomic radius of Ni and Mn proved beneficial for synthesizing bimetallic NiMn-MOF, exposing additional active sites. The optimization of process parameters resulted in bimetallic NiMn-MOF electrode materials with high specific volumes. The morphology and crystal structure of the electrode materials were characterized in detail via scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The electrochemical properties were also analyzed using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The results showed an impressive specific capacitance of 1023.5 F/g at 0.5 A/g in a 6 mol/L KOH electrolyte. Additionally, an assembled asymmetric supercapacitor delivered a capacitance of 94.37 F/g at 0.5 A/g, successfully powered a red LED. This outcome underscores the excellent electrochemical performance of NiMn-MOF, offering a new approach to preparing electrode materials for supercapacitors.

Key words: NiMn-MOF, electrode materials, supercapacitors, electrochemical performances

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