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<p>Molybdenum diselenide (MoSe<sub>2</sub>), a transition metal diselenide, exhibits substantial pseudocapacitive behavior but suffers from intrinsically low electrical conductivity. This limitation impedes rapid electron transport within electrodes, particularly during high-rate charge/discharge cycles. To address this challenge, we engineered MoSe<sub>2</sub>/C composites by integrating conductive carbon matrices that serve as efficient “electron highways,” significantly enhancing overall electrical conductivity. The composites were synthesized via a one-step hydrothermal method using glucose as the carbon source directly introduced into the MoSe<sub>2</sub> precursor system. Structural and morphological characterizations (SEM, XRD, and XPS) confirmed the successful formation of lamellar MoSe<sub>2</sub>/C nanocomposites. Electrochemical evaluation revealed the special performance of the supercapacitor. At 1 A g<sup>−1</sup>, the specific capacitance of the optimized composite electrode was 235.85 F g<sup>−1</sup>, which was 69.4% higher than that of the original MoSe<sub>2</sub>. After 500 cycles, it maintained 96.8% capacity retention with a 33.1% improvement in cycling stability. A systematic investigation of carbon doping ratios (across four experimental groups) revealed a volcano-shaped relationship between electrochemical performance and carbon content. The experimental findings suggest that the optimal carbon doping ratio for the prepared MoSe₂/C composite material is attained at a raw material molar ratio of 1:10. The carbon framework facilitates rapid Faradaic reactions at MoSe<sub>2</sub> active sites, thereby substantially boosting both rate capability and long-term cycling stability.</p>

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Design and synthesis of MoSe2/C composites for the high-performance supercapacitor electrode material

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Sheng-xue Yan,
  • Han-sai Liu,
  • Zuo-hao Liu,
  • Shao-hua Luo,
  • Qing Wang,
  • Ya-hui Zhang,
  • Xin Liu,
  • Jing Guo

摘要

Molybdenum diselenide (MoSe2), a transition metal diselenide, exhibits substantial pseudocapacitive behavior but suffers from intrinsically low electrical conductivity. This limitation impedes rapid electron transport within electrodes, particularly during high-rate charge/discharge cycles. To address this challenge, we engineered MoSe2/C composites by integrating conductive carbon matrices that serve as efficient “electron highways,” significantly enhancing overall electrical conductivity. The composites were synthesized via a one-step hydrothermal method using glucose as the carbon source directly introduced into the MoSe2 precursor system. Structural and morphological characterizations (SEM, XRD, and XPS) confirmed the successful formation of lamellar MoSe2/C nanocomposites. Electrochemical evaluation revealed the special performance of the supercapacitor. At 1 A g−1, the specific capacitance of the optimized composite electrode was 235.85 F g−1, which was 69.4% higher than that of the original MoSe2. After 500 cycles, it maintained 96.8% capacity retention with a 33.1% improvement in cycling stability. A systematic investigation of carbon doping ratios (across four experimental groups) revealed a volcano-shaped relationship between electrochemical performance and carbon content. The experimental findings suggest that the optimal carbon doping ratio for the prepared MoSe₂/C composite material is attained at a raw material molar ratio of 1:10. The carbon framework facilitates rapid Faradaic reactions at MoSe2 active sites, thereby substantially boosting both rate capability and long-term cycling stability.