Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (11): 20250191.doi: 10.7503/cjcu20250191

• Physical Chemistry • Previous Articles     Next Articles

Synthesis and Electrochemical Performance of Nanostructured Co-Nd-MOF/GO Electrode Materials

WANG Delong1, XING Shilu1, LI Chunli1,2(), ZHOU Nan1, HAO Yaling1, HUO Rong1, LI Xiuhua1, LIU Huifeng1   

  1. 1.Resource and Environmental Engineering College
    2.Key Laboratory of Environmental Pollution Control and Restoration of Colleges and Universities in Autonomous Region,Inner Mongolia University of Technology,Hohhot 010000,China
  • Received:2025-07-07 Online:2025-11-10 Published:2025-09-18
  • Contact: LI Chunli E-mail:lichunli16@163.com
  • Supported by:
    the Inner Mongolia Natural Science Foundation, China(2023LHMS05020);the Basic Scientific Research Operating Expenses Project of Universities Directly Affiliated to the Autonomous Region, China(JY20220042)

Abstract:

Vanadium redox flow batteries(VRFB) are considered to be one of the most promising technologies for large-scale energy storage, and the low energy efficiency of electrode materials at high current densities is one of the main constraints to the development of VRFB. However, modification and modification of the electrode materials can improve their energy efficiency and stability. In this study, neodymium-based metal-organic framework(Nd-MOF) was used as a precursor and transition metal cobalt was introduced for doping. Meanwhile, Co-Nd-MOF was made to bond with graphene oxide(GO) with high electrical conductivity through its oxygen-containing functional groups, and then a Co-Nd-MOF/GO-2 composite with excellent electrochemical performance was prepared by hydrothermal method and applied as an electrode material for modifying the blank carbon felts(CF) in the anode of VRFBs. The electrochemical test results demonstrated that Co-Nd-MOF/GO-2 had excellent electrocatalytic effect on the redox reaction of V2+/V3+, which could improve the voltage efficiency(VE) and energy efficiency(EE) of VRFBs. At 50 mA/cm2, the Co-Nd-MOF/GO-2 composite-modified electrode decreased the overpotential by 259.7 mV and increased the discharge capacity by 263 mA·h compared with CF, and increased the VE and EE by 9.2% and 10%, respectively, compared with CF at 140 mA/cm2. After cycling, the current density was tuned back to 50 mA/cm2, and the VE and EE almost had no attenuation. It was demonstrated that the doping of Co provided additional metal nodes and free holes, the composite of GO reduced the degree of agglomeration of MOF and provided more active sites for V2+/V3+, which facilitated charge transfer and ionic transfer, and the synergistic effect between GO and Co-Nd-MOF further led to the enhancement of the electrical conductivity of composite electrode materials. This study provides a practical approach to advance the further application of VRFB.

Key words: Metal-organic framework, Co-doping, Graphene oxide, Vanadium redox flow battery, Electrocatalytic activity

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