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<p>The limited energy density and poor electrical conductivity of conventional supercapacitor electrodes restrict their application in advanced energy storage systems. In this work, BiCoO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> nanocomposites with different compositions were synthesized via solid-state mixing of hydrothermally prepared BiCoO<sub>3</sub> and thermally treated g-C<sub>3</sub>N<sub>4</sub>obtained through thermal treatment, to combine the redox activity of BiCoO<sub>3</sub> with the sable, nitrogen-rich framework of g-C<sub>3</sub>N<sub>4</sub>. Structural analysis confirms the formation of well-integrated hybrid materials with improved interfacial interaction. Electrochemical studies show that g-C<sub>3</sub>N<sub>4</sub> exhibits electric double-layer capacitance, while BiCoO<sub>3</sub> delivers a high specific capacitance of 710&#xa0;F g<sup>− 1</sup>. The composite electrodes show better electrochemical performance, with BiCoO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub>-90 giving a specific capacitance of 161.5&#xa0;F g<sup>− 1</sup> at 1&#xa0;A g<sup>− 1</sup>, a moderate energy density of 3.46 Wh kg<sup>− 1</sup>, and a power density of about 6600&#xa0;W kg<sup>− 1</sup>. The electrode also shows stable cycling behaviour, retaining around 94–95% of its capacitance after 2000 cycles. The improved performance is ascribed to the combined surface capacitive and Faradaic contributions, which enhance charge transfer and ion transport.</p>

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Composition-dependent electrochemical performance of BiCoO3/g-C3N4 nanocomposites for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Ravi Aswini,
  • Annamalai Padmanaban,
  • H. Premkumar,
  • C. Naveen,
  • Arunachalam Arulraj,
  • Hector Valdes,
  • J. Baalamurugan,
  • Ganesh Kumar V

摘要

The limited energy density and poor electrical conductivity of conventional supercapacitor electrodes restrict their application in advanced energy storage systems. In this work, BiCoO3/g-C3N4 nanocomposites with different compositions were synthesized via solid-state mixing of hydrothermally prepared BiCoO3 and thermally treated g-C3N4obtained through thermal treatment, to combine the redox activity of BiCoO3 with the sable, nitrogen-rich framework of g-C3N4. Structural analysis confirms the formation of well-integrated hybrid materials with improved interfacial interaction. Electrochemical studies show that g-C3N4 exhibits electric double-layer capacitance, while BiCoO3 delivers a high specific capacitance of 710 F g− 1. The composite electrodes show better electrochemical performance, with BiCoO3/g-C3N4-90 giving a specific capacitance of 161.5 F g− 1 at 1 A g− 1, a moderate energy density of 3.46 Wh kg− 1, and a power density of about 6600 W kg− 1. The electrode also shows stable cycling behaviour, retaining around 94–95% of its capacitance after 2000 cycles. The improved performance is ascribed to the combined surface capacitive and Faradaic contributions, which enhance charge transfer and ion transport.