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<p>A polyaniline-Mn<sub>3</sub>O<sub>4</sub> nanocomposite has been prepared using a chemical oxidative polymerization technique for supercapacitor application. The conductive state of polyaniline has been tuned using different inorganic acids (nitric acid, sulfuric acid, phosphoric acid) as dopants in the polyaniline-Mn<sub>3</sub>O<sub>4</sub> nanocomposite. The structural, optical, and morphological studies on the effect of various dopants in the nanocomposites have been studied. It has been found that nitric acid-doped polyaniline-Mn<sub>3</sub>O<sub>4</sub> nanocomposite is in the high oxidation state, which is in the emeraldine state of the polymer. These insights motivated me to understand the electrochemical properties of these various acid-doped polyaniline-Mn<sub>3</sub>O<sub>4</sub> nanocomposites. Nitric acid doped polyaniline-Mn<sub>3</sub>O<sub>4</sub> nanocomposite outperforms compared to other composites, delivering a specific capacitance of 302.9&#xa0;F g<sup>−1</sup> at 5 mV s<sup>−1</sup> (274.4&#xa0;F g<sup>−1</sup> vs. sulfuric acid, 42.2&#xa0;F g<sup>−1</sup> vs. phosphoric acid). Also, nitric acid-doped polyaniline-Mn<sub>3</sub>O<sub>4</sub> nanocomposite delivers cyclability of over 2000 cycles, confirming the role of dopants in enhancing electrochemical performance.</p> Graphical abstract <p></p>

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Tuning the oxidation state of polyaniline in Mn3O4/polyaniline nanocomposite for supercapacitor application

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Ajay Piriya Vijaya Kumar Saroja,
  • K. Nehru,
  • M. Sivakumar,
  • Daniel T. Thangadurai,
  • D. Shanthanalakshmi,
  • S. Santhoshkumar,
  • Manivannan Madhu,
  • Wei-Lung Tseng

摘要

A polyaniline-Mn3O4 nanocomposite has been prepared using a chemical oxidative polymerization technique for supercapacitor application. The conductive state of polyaniline has been tuned using different inorganic acids (nitric acid, sulfuric acid, phosphoric acid) as dopants in the polyaniline-Mn3O4 nanocomposite. The structural, optical, and morphological studies on the effect of various dopants in the nanocomposites have been studied. It has been found that nitric acid-doped polyaniline-Mn3O4 nanocomposite is in the high oxidation state, which is in the emeraldine state of the polymer. These insights motivated me to understand the electrochemical properties of these various acid-doped polyaniline-Mn3O4 nanocomposites. Nitric acid doped polyaniline-Mn3O4 nanocomposite outperforms compared to other composites, delivering a specific capacitance of 302.9 F g−1 at 5 mV s−1 (274.4 F g−1 vs. sulfuric acid, 42.2 F g−1 vs. phosphoric acid). Also, nitric acid-doped polyaniline-Mn3O4 nanocomposite delivers cyclability of over 2000 cycles, confirming the role of dopants in enhancing electrochemical performance.

Graphical abstract