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<p>A new composite based on V<sub>2</sub>CT<sub>x</sub> with a core–shell structure (Co-NCNT/VN/V<sub>2</sub>CT<sub>x</sub>) is prepared by a simple one-pot method. Dicyandiamide (DCD) is introduced as the dual-source precursor for both nitrogen and carbon, while Co(NO<sub>3</sub>)<sub>2</sub> is added to catalyze the growth of Nitrogen-doped carbon nanotubes (N-CNTs) shell layer on the surface of V<sub>2</sub>CT<sub>x</sub>. After pyrolysis in a nitrogen atmosphere, the composite Co-NCNT/VN/V<sub>2</sub>CT<sub>x</sub> with a core–shell structure was obtained. The N-CNTs exhibit uniform growth morphology on the V<sub>2</sub>CT<sub>x</sub> layer and form a three-dimensional network configuration, which significantly enhances both the specific surface area (305.2 m<sup>2</sup>/g) and electrical conductivity of the material. The composite exhibits a specific capacitance of 862 F g<sup>−1</sup> when measured in 3&#xa0;M KOH electrolyte. The voltage window ranges from -0.8&#xa0;V to + 0.2&#xa0;V, representing a 0.4&#xa0;V expansion compared to that of pristine V<sub>2</sub>CT<sub>x.</sub> The electrode demonstrates exceptional cycling stability, with 95.6% of its initial capacity preserved after 10,000 cycles. An asymmetric supercapacitors is fabricated utilizing the composite material as the negative electrode, and the composite with Co–Ni layered double hydroxide (CoNi-LDH@Co-NCNT/VN/V<sub>2</sub>CT<sub>x</sub>) as the positive electrode. The electrochemical performance of the device demonstrates a working potential range spanning from 0 to 1.6&#xa0;V, achieving a specific capacitance of 282.4 F g<sup>⁻1</sup> under standard measurement conditions. Notably, the system delivers an impressive energy density of 30.9 Wh kg<sup>−1</sup> while maintaining a power density of 800 W kg<sup>−1</sup>.</p>

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One-pot preparation of Co-NCNT/VN/V2CTx composite with a core–shell structure and its application in supercapacitors

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Xiaojie Liu,
  • Tingyao Du,
  • Jing Zhang,
  • Jianyu Guo,
  • Yan Lu

摘要

A new composite based on V2CTx with a core–shell structure (Co-NCNT/VN/V2CTx) is prepared by a simple one-pot method. Dicyandiamide (DCD) is introduced as the dual-source precursor for both nitrogen and carbon, while Co(NO3)2 is added to catalyze the growth of Nitrogen-doped carbon nanotubes (N-CNTs) shell layer on the surface of V2CTx. After pyrolysis in a nitrogen atmosphere, the composite Co-NCNT/VN/V2CTx with a core–shell structure was obtained. The N-CNTs exhibit uniform growth morphology on the V2CTx layer and form a three-dimensional network configuration, which significantly enhances both the specific surface area (305.2 m2/g) and electrical conductivity of the material. The composite exhibits a specific capacitance of 862 F g−1 when measured in 3 M KOH electrolyte. The voltage window ranges from -0.8 V to + 0.2 V, representing a 0.4 V expansion compared to that of pristine V2CTx. The electrode demonstrates exceptional cycling stability, with 95.6% of its initial capacity preserved after 10,000 cycles. An asymmetric supercapacitors is fabricated utilizing the composite material as the negative electrode, and the composite with Co–Ni layered double hydroxide (CoNi-LDH@Co-NCNT/VN/V2CTx) as the positive electrode. The electrochemical performance of the device demonstrates a working potential range spanning from 0 to 1.6 V, achieving a specific capacitance of 282.4 F g⁻1 under standard measurement conditions. Notably, the system delivers an impressive energy density of 30.9 Wh kg−1 while maintaining a power density of 800 W kg−1.