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<p>A ZnWO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> heterostructure electrode was synthesized and evaluated for advanced electrochemical energy-storage and photocatalytic applications. The formation of a heterojunction between ZnWO<sub>4</sub> and graphitic carbon nitride significantly enhances ion transport, electronic conductivity and electroactive surface accessibility. Structural and spectroscopic analyses were suggesting strong integration of ZnWO<sub>4</sub> and g-C<sub>3</sub>N<sub>4</sub> within the nanocomposite material. Electrochemical investigations demonstrate an exceptionally high specific capacitance of 2225&#xa0;F g⁻¹ for the ZnWO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> electrode, markedly surpassing then pure ZnWO<sub>4</sub> 876&#xa0;F g<sup>− 1</sup>, along with excellent rate capability. Kinetic analysis based on cyclic voltammetry reveals that surface-controlled capacitive processes contribute to charge storage, contributing approximately 64–69% of the total capacitance, indicative of rapid ion diffusion and efficient charge-transfer dynamics. Electrochemical impedance spectroscopy further confirms enhanced electrolyte-electrode interaction in the heterostructure. In addition, the ZnWO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> composite exhibits improved visible-light-driven photocatalytic degradation of organic pollutants (85% within 60&#xa0;min), suggesting improved charge separation at the heterointerface. The synergistic enhancement of ionics, pseudocapacitive behaviour, and charge-transfer kinetics highlights ZnWO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> as a promising electrode material for high-performance supercapacitors and multifunctional electrochemical systems.</p>

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Synergistic ion transport and charge storage in ZnWO4/g-C3N4 heterostructures for high performance supercapacitors and accelerated photocatalytic degradation

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • N. Venkatachalam,
  • M. Prabhaharan,
  • V. Sasikala,
  • C. Naveen,
  • Muthumareeswaran Muthuramamoorthy,
  • Shofiur Rahman,
  • S. Thanka Rajan,
  • Rekha Pachaiappan

摘要

A ZnWO4/g-C3N4 heterostructure electrode was synthesized and evaluated for advanced electrochemical energy-storage and photocatalytic applications. The formation of a heterojunction between ZnWO4 and graphitic carbon nitride significantly enhances ion transport, electronic conductivity and electroactive surface accessibility. Structural and spectroscopic analyses were suggesting strong integration of ZnWO4 and g-C3N4 within the nanocomposite material. Electrochemical investigations demonstrate an exceptionally high specific capacitance of 2225 F g⁻¹ for the ZnWO4/g-C3N4 electrode, markedly surpassing then pure ZnWO4 876 F g− 1, along with excellent rate capability. Kinetic analysis based on cyclic voltammetry reveals that surface-controlled capacitive processes contribute to charge storage, contributing approximately 64–69% of the total capacitance, indicative of rapid ion diffusion and efficient charge-transfer dynamics. Electrochemical impedance spectroscopy further confirms enhanced electrolyte-electrode interaction in the heterostructure. In addition, the ZnWO4/g-C3N4 composite exhibits improved visible-light-driven photocatalytic degradation of organic pollutants (85% within 60 min), suggesting improved charge separation at the heterointerface. The synergistic enhancement of ionics, pseudocapacitive behaviour, and charge-transfer kinetics highlights ZnWO4/g-C3N4 as a promising electrode material for high-performance supercapacitors and multifunctional electrochemical systems.