Journal of Lanzhou University of Technology ›› 2024, Vol. 50 ›› Issue (6): 17-27.

• Materials Science and Engineering • Previous Articles     Next Articles

Electrochemical properties of coral-like nickel-cobalt bimetallic oxide-doped carbon nanohybrid materials

MA Ying-xia1,2, LEI Lei1,2, LIU Bing-lu1,2, KANG Xiao-ya1,2, RAN Fen1,2   

  1. 1. School of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2023-11-21 Online:2024-12-28 Published:2025-01-13

Abstract: Metal-organic frameworks (MOFs) have received attention as supercapacitor electrode materials due to their large specific surface area, adjustable pore size and abundant redox sites. However, the specific capacitance of MOFs limits their further application. In this paper, employing three-dimensional (3D) spiny cypress-like Ni/Co-MOF as precursors obtained by hydrothermal method using Ni (NO3)2·6H2O and Co (NO3)2·6H2O as the metal ion sources and terephthalic acid as the organic ligand, a series of coral-like nickel-cobalt bimetallic oxide-doped carbon nanohybrid materials (NCPO/C) were prepared in an air atmosphere by regulatingthe heat treatment temperature and isothermal time, and their electrochemical properties as supercapacitor electrode materials were investigated. The results showed that the coral-like NCPO/C sample obtained byheating the 3D spiny cypress-like Ni/Co-MOF precursor at 280 ℃ for 1 h in air atmosphere, has the best electrochemical performance as electrode materials. When the current density expand from 0.5 A·g-1 to 5.0 A·g-1, the specific capacitance of NCPO/C decrease from 852.5 C·g-1 to 720.0 C·g-1, and the capacitance retention 84.5%.

Key words: metal-organic framework materials, metal oxides, supercapacitors, electrode materials, electrochemical performance

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