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<p>A sustainable synthesis route was adopted to prepare a composite comprising silver (Ag) nanoparticles embedded within a polyindole and graphitic carbon nitride (g-C₃N₄) matrix, intended for use as an active electrode in supercapacitors and photocatalytic applications. The material was comprehensively characterized by UV–Visible spectroscopy, FTIR, TEM/HRTEM, and BET isotherm analysis. Electrochemical evaluation, performed in a three-electrode setup with 1.0&#xa0;M H₂SO₄ as the electrolyte, revealed a high specific capacitance of 1022.8&#xa0;F g⁻¹ and excellent cycling stability, with 93% capacitance retention after 10,000 charge–discharge cycles at 0.5&#xa0;A g⁻¹. Ragone plot analysis corroborated the superior capacitive properties of the composites. Additionally, its photocatalytic efficiency was demonstrated in Rhodamine B dye degradation, achieving 98.9% removal within 120&#xa0;min and following pseudo-first-order kinetics. These findings position the Ag/polyindole@g-C₃N₄ composite as a promising multifunctional material for both advanced supercapacitor electrodes and photocatalytic wastewater treatment applications.</p> Graphical Abstract <p></p>

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Silver-polyindole decorated graphitic carbon nitride (g-C3N4) nanohybrids for improved pseudocapacitance and photocatalytic degradation of rhodamine B

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • M. Bhuvaneswari,
  • M. Muthukrishnaveni,
  • A. C. Ramesh Babu,
  • A. Raja,
  • B. Krishnakumar,
  • R. Marnadu,
  • S. AlFaify,
  • Mohd. Shkir

摘要

A sustainable synthesis route was adopted to prepare a composite comprising silver (Ag) nanoparticles embedded within a polyindole and graphitic carbon nitride (g-C₃N₄) matrix, intended for use as an active electrode in supercapacitors and photocatalytic applications. The material was comprehensively characterized by UV–Visible spectroscopy, FTIR, TEM/HRTEM, and BET isotherm analysis. Electrochemical evaluation, performed in a three-electrode setup with 1.0 M H₂SO₄ as the electrolyte, revealed a high specific capacitance of 1022.8 F g⁻¹ and excellent cycling stability, with 93% capacitance retention after 10,000 charge–discharge cycles at 0.5 A g⁻¹. Ragone plot analysis corroborated the superior capacitive properties of the composites. Additionally, its photocatalytic efficiency was demonstrated in Rhodamine B dye degradation, achieving 98.9% removal within 120 min and following pseudo-first-order kinetics. These findings position the Ag/polyindole@g-C₃N₄ composite as a promising multifunctional material for both advanced supercapacitor electrodes and photocatalytic wastewater treatment applications.

Graphical Abstract