2 at 1173 K. Appropriate temperature conditions are favorable for suppressing the in-situ sintering growth of HEC particles. Electrochemical performance tests were conducted in 1 mol/L KOH solution to investigate the catalytic performance of (VNbTaZrHf)C HEC. The catalytic performance of (VNbTaZrHf)C HEC for hydrogen evolution reaction (HER) was evaluated through polarization curves, Tafel slope, electrochemical impedance spectroscopy, and double-layer capacitance value cyclic voltammetry tests. Results show that the double-layer capacitance value of (VZrHfNbTa)C HEC is 40.6 mF/cm2. The larger the double-layer capacitance value, the larger the electrochemically active surface area. Due to the high-entropy effect and nanoscale structure of (VNbTaZrHf)C HEC, it exhibits superior catalytic performance to HER. This research provides a novel method for the preparation of HECs via molten salt electro-deoxidation."/>

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Preparation of Nanoscale (VNbTaZrHf)C High-Entropy Carbides via Molten Salt Electro-deoxidation and Its Catalytic Performance of Hydrogen Evolution Reaction
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1.Comprehensive Testing and Analyzing Center, North China University of Science and Technology, Tangshan 063009, China;2.College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China;3.College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;4.Key Laboratory of Material Processing and Mold Technology, School of Mechanical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China

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Fund Project:

Chongqing Natural Science Foundation (cstc2021jcyj-msxmX1049); Tangshan Science and Technology Innovation Team Training Plan Project (21130207D)

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    Abstract:

    The nanoscale (VNbTaZrHf)C high-entropy carbide (HEC) powders with face-centered cubic structure were prepared by electro-deoxidation of metal oxides and graphite in CaCl2 at 1173 K. Appropriate temperature conditions are favorable for suppressing the in-situ sintering growth of HEC particles. Electrochemical performance tests were conducted in 1 mol/L KOH solution to investigate the catalytic performance of (VNbTaZrHf)C HEC. The catalytic performance of (VNbTaZrHf)C HEC for hydrogen evolution reaction (HER) was evaluated through polarization curves, Tafel slope, electrochemical impedance spectroscopy, and double-layer capacitance value cyclic voltammetry tests. Results show that the double-layer capacitance value of (VZrHfNbTa)C HEC is 40.6 mF/cm2. The larger the double-layer capacitance value, the larger the electrochemically active surface area. Due to the high-entropy effect and nanoscale structure of (VNbTaZrHf)C HEC, it exhibits superior catalytic performance to HER. This research provides a novel method for the preparation of HECs via molten salt electro-deoxidation.

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[Yang Yu, Chen Geng, Li Hui, Liang Jinglong, Hu Meilong, Hu Mengjun. Preparation of Nanoscale (VNbTaZrHf)C High-Entropy Carbides via Molten Salt Electro-deoxidation and Its Catalytic Performance of Hydrogen Evolution Reaction[J]. Rare Metal Materials and Engineering,2024,53(6):1566~1573.]
DOI：10.12442/j. issn.1002-185X.20230580

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History
  • Received:September 14,2023
  • Revised:November 07,2023
  • Adopted:November 13,2023
  • Online: June 20,2024
  • Published: June 17,2024