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<p>Carbon nitride has recently transpired as the inevitable two-dimensional polymeric layered material tailoring in various fields due to its chemical stability and tunable band gap. Herein, the facile and scalable synthesis through the thermal polymerization of 3-amino-1,2,4-triazole precursor serendipitously forms another stable allotrope, C<sub>3</sub>N<sub>5</sub>. An ultrathin C<sub>3</sub>N<sub>5</sub> nanosheet was fortuitously achieved through the protonation process. Because of its electron-rich character and delamination of the stacked interlayer, the hydrochloric acid-treated C<sub>3</sub>N<sub>5</sub> is endowed with ultra-high capacitance and impressive cyclic stability, outperforming the other carbon and metal oxide-based materials. As a result, it attains a high specific capacitance of 875 F/g, which is eight-fold higher than the pristine C<sub>3</sub>N<sub>5</sub> and other acid-treated C<sub>3</sub>N<sub>5</sub>. It also displayed excellent cyclic stability of 100% over 10,000 cycles. Furthermore, the fabricated symmetric device demonstrated remarkable power and energy densities of 480 W/kg and 18 Wh/kg, respectively, with excellent cyclic stability of 90% over 5000 cycles. The rate capability and improved capacitance of hydrochloric acid-treated C<sub>3</sub>N<sub>5</sub> are due to the effective construction of charged ions from the synergistically interplayed effect of segregated stacked interlayers with their strong in-planar heptazine unit of electron-rich nitrogen moieties. Additionally, ex situ Raman and SEM investigations were also performed, highlighting the CN heterocyclic unit robust structural packing even after the cycling mechanism. This will be an archetype for future sustainable development with commendable electrochemical properties as a resurgence to meet global energy demand.</p> Graphical abstract <p></p>

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Tailoring nitrogen-rich C3N5 nanosheets as a potential electrode material for high-performance supercapacitor

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Mahalakshmi Subbiah,
  • Kasiviswanathan Muthusamy,
  • Anandhakuma Sundaramurthy,
  • Sabarinathan Venkatachalam,
  • Nishakavya Saravanan,
  • Sudhagar Pitchaimuthu,
  • Nagarajan Srinivasan

摘要

Carbon nitride has recently transpired as the inevitable two-dimensional polymeric layered material tailoring in various fields due to its chemical stability and tunable band gap. Herein, the facile and scalable synthesis through the thermal polymerization of 3-amino-1,2,4-triazole precursor serendipitously forms another stable allotrope, C3N5. An ultrathin C3N5 nanosheet was fortuitously achieved through the protonation process. Because of its electron-rich character and delamination of the stacked interlayer, the hydrochloric acid-treated C3N5 is endowed with ultra-high capacitance and impressive cyclic stability, outperforming the other carbon and metal oxide-based materials. As a result, it attains a high specific capacitance of 875 F/g, which is eight-fold higher than the pristine C3N5 and other acid-treated C3N5. It also displayed excellent cyclic stability of 100% over 10,000 cycles. Furthermore, the fabricated symmetric device demonstrated remarkable power and energy densities of 480 W/kg and 18 Wh/kg, respectively, with excellent cyclic stability of 90% over 5000 cycles. The rate capability and improved capacitance of hydrochloric acid-treated C3N5 are due to the effective construction of charged ions from the synergistically interplayed effect of segregated stacked interlayers with their strong in-planar heptazine unit of electron-rich nitrogen moieties. Additionally, ex situ Raman and SEM investigations were also performed, highlighting the CN heterocyclic unit robust structural packing even after the cycling mechanism. This will be an archetype for future sustainable development with commendable electrochemical properties as a resurgence to meet global energy demand.

Graphical abstract