Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (2): 361-369.doi: 10.19799/j.cnki.2095-4239.2023.0545

• Energy Storage Materials and Devices • Previous Articles     Next Articles

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

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

CLC Number: