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<p>A distinct optical-electrochemical correlation is uncovered in acid-free synthesized polyaniline/zinc oxide (PANI/ZnO) nanocomposites, revealing how controlled ZnO incorporation governs charge-storage dynamics and interfacial behavior. The acid-free oxidative polymerization route enables sustainable, reproducible synthesis with uniform ZnO dispersion and robust PANI-ZnO coupling. Structural characterizations including XRD, FTIR, TEM, and XPS confirm the successful incorporation of ZnO within the PANI matrix and strong interfacial interaction. Systematic compositional tuning (2–10 wt% ZnO) demonstrates that bandgap narrowing and enhanced electronic disorder favor improved ion diffusion, redox kinetics, and charge-transport efficiency. The composite containing 8 wt% ZnO exhibits the most balanced performance, delivering a specific capacitance of 163&#xa0;F g<sup>− 1</sup>, energy density of 32.7 Wh kg<sup>− 1</sup>, and 87% retention after 2000 cycles in 1 M H<sub>2</sub>SO<sub>4</sub>. Two-electrode assessments confirm comparable trends, validating the scalability and consistency of the acid-free system. The integrated optical and electrochemical findings indicate that precise modulation of the polymer-oxide interface can effectively tune charge-transfer characteristics, identifying acid-free PANI/ZnO nanocomposites as sustainable, high-rate, and durable electrode materials for next-generation supercapacitor technologies.</p>

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Integrating conductive polymer and metal oxide: PANI/ZnO nanocomposite for supercapacitor application

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Geethu Joseph,
  • Aryadevi G.,
  • Veena Rose Mathew,
  • Alex Jose,
  • Lisa Mariam Saji,
  • Manjima T. K.,
  • Alex Joseph,
  • Ginson P. Joseph

摘要

A distinct optical-electrochemical correlation is uncovered in acid-free synthesized polyaniline/zinc oxide (PANI/ZnO) nanocomposites, revealing how controlled ZnO incorporation governs charge-storage dynamics and interfacial behavior. The acid-free oxidative polymerization route enables sustainable, reproducible synthesis with uniform ZnO dispersion and robust PANI-ZnO coupling. Structural characterizations including XRD, FTIR, TEM, and XPS confirm the successful incorporation of ZnO within the PANI matrix and strong interfacial interaction. Systematic compositional tuning (2–10 wt% ZnO) demonstrates that bandgap narrowing and enhanced electronic disorder favor improved ion diffusion, redox kinetics, and charge-transport efficiency. The composite containing 8 wt% ZnO exhibits the most balanced performance, delivering a specific capacitance of 163 F g− 1, energy density of 32.7 Wh kg− 1, and 87% retention after 2000 cycles in 1 M H2SO4. Two-electrode assessments confirm comparable trends, validating the scalability and consistency of the acid-free system. The integrated optical and electrochemical findings indicate that precise modulation of the polymer-oxide interface can effectively tune charge-transfer characteristics, identifying acid-free PANI/ZnO nanocomposites as sustainable, high-rate, and durable electrode materials for next-generation supercapacitor technologies.