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<p>Developing electrode materials for supercapacitors with high specific capacitance, structural stability and economic efficiency still faces numerous challenges. In this study, taking advantage of the unique structural properties of two-dimensional layered g-C<sub>3</sub>N<sub>4</sub>, the g-C<sub>3</sub>N<sub>4</sub>-AC (activated carbon) hierarchically porous composite was prepared using a simple thermal polymerization method to optimize the pore structure of lignite-based AC and enhance its electrochemical performance. The introduction of g-C<sub>3</sub>N<sub>4</sub> can effectively regulate the pore size distribution of AC, increase active sites and facilitate the rapid transport of electrolyte ions. The as-prepared g-C<sub>3</sub>N<sub>4</sub>-AC hierarchically porous composite exhibits a significantly improved specific capacitance of 182.40 F g<sup>−1</sup> at a current density of 0.5 A g<sup>−1</sup>, which is much higher than that of pristine lignite-based AC (107.80 F g<sup>−1</sup>). After 10 000 charge–discharge cycles at a high current density of 10 A g<sup>−1</sup>, the composite still preserves 96.4% of its initial capacitance with a Coulombic efficiency of 99.8%, highlighting its remarkable long-term stability. This work provides a new strategy and insight for the design of high-performance and low-cost carbon-based electrode materials for supercapacitors.</p>

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Construction of g-C3N4-AC hierarchical porous composite and study on supercapacitor performance

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Liguo Wei,
  • Zhuo Ren,
  • Lishuang Zhao,
  • Shenglin Cao,
  • Yunting Ju,
  • Chunjiong Lu,
  • Yuan He,
  • Jiaming Yu

摘要

Developing electrode materials for supercapacitors with high specific capacitance, structural stability and economic efficiency still faces numerous challenges. In this study, taking advantage of the unique structural properties of two-dimensional layered g-C3N4, the g-C3N4-AC (activated carbon) hierarchically porous composite was prepared using a simple thermal polymerization method to optimize the pore structure of lignite-based AC and enhance its electrochemical performance. The introduction of g-C3N4 can effectively regulate the pore size distribution of AC, increase active sites and facilitate the rapid transport of electrolyte ions. The as-prepared g-C3N4-AC hierarchically porous composite exhibits a significantly improved specific capacitance of 182.40 F g−1 at a current density of 0.5 A g−1, which is much higher than that of pristine lignite-based AC (107.80 F g−1). After 10 000 charge–discharge cycles at a high current density of 10 A g−1, the composite still preserves 96.4% of its initial capacitance with a Coulombic efficiency of 99.8%, highlighting its remarkable long-term stability. This work provides a new strategy and insight for the design of high-performance and low-cost carbon-based electrode materials for supercapacitors.