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<p>The two-dimensional g-C<sub>3</sub>N<sub>4</sub> nanosheets and MnO<sub>2</sub> nanorods were combined to create high-power flexible supercapacitor electrodes. Carbon nanorods’ electrical conductivity increased with the addition of MnO<sub>2</sub>, while their energy storage capacity increased with MnO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> decoration. By varying the C concentration, the impact of the metal (MnO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub>) ratio on the supercapacitor’s overall electrochemical performance was examined. MnO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> nanorods increased electrochemical activity by making it easier for the electrolyte to move into the electrode. Additionally, the nanorods accelerated the composite electrode’s charge transfer rate, which enhanced the electrochemical performance as a whole. The developed asymmetric supercapacitor cell has a specific capacity of 592.54 Fg<sup>−1</sup> and has Faradic characteristics. After 10,000 GCD cycles, it retains 87.3% of its capacity. The MnO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> electrode’s exceptional electrochemical behavior demonstrates that it is a good choice for asymmetric supercapacitors’ negative electrode material. Furthermore, the constructed cell has a specific energy of 31.86 Wh kg<sup>−1</sup> and a high specific power of 5398 W kg<sup>−1</sup>. Based on these findings, the MnO₂/g-C₃N₄ nanocomposite demonstrates strong potential as an efficient and stable electrode material for supercapacitor applications.</p>

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Design of MnO2/g-C3N4 nanocomposite and its effect on improving supercapacitor performance by structural modification

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • D. Sridhar,
  • S. Manikandan,
  • R. Gobi

摘要

The two-dimensional g-C3N4 nanosheets and MnO2 nanorods were combined to create high-power flexible supercapacitor electrodes. Carbon nanorods’ electrical conductivity increased with the addition of MnO2, while their energy storage capacity increased with MnO2/g-C3N4 decoration. By varying the C concentration, the impact of the metal (MnO2/g-C3N4) ratio on the supercapacitor’s overall electrochemical performance was examined. MnO2/g-C3N4 nanorods increased electrochemical activity by making it easier for the electrolyte to move into the electrode. Additionally, the nanorods accelerated the composite electrode’s charge transfer rate, which enhanced the electrochemical performance as a whole. The developed asymmetric supercapacitor cell has a specific capacity of 592.54 Fg−1 and has Faradic characteristics. After 10,000 GCD cycles, it retains 87.3% of its capacity. The MnO2/g-C3N4 electrode’s exceptional electrochemical behavior demonstrates that it is a good choice for asymmetric supercapacitors’ negative electrode material. Furthermore, the constructed cell has a specific energy of 31.86 Wh kg−1 and a high specific power of 5398 W kg−1. Based on these findings, the MnO₂/g-C₃N₄ nanocomposite demonstrates strong potential as an efficient and stable electrode material for supercapacitor applications.