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<p>Mixed transition metal oxides are promising candidates for energy conversion and storage owing to their high electrical conductivity and versatile redox behaviour. In this work, a manganese–titanium–cobalt oxide/polyaniline (MTC/PANI) composite was successfully prepared using a facile sonication-assisted approach. The phase, structural, and morphological characteristics of the synthesised materials were confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photon spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) analyses. Brunauer–Emmett–Teller (BET) analysis revealed the porous nature and surface properties. The excellent electrocatalytic performance towards the hydrogen evolution reaction (HER) in alkaline media is demonstrated by the MTC/PANI composite, with a current density of 10&#xa0;mA&#xa0;cm<sup>−2</sup> at an overpotential of 257&#xa0;mV and a low Tafel slope of 158&#xa0;mV dec<sup>−1</sup>. Moreover, the composite displayed remarkable supercapacitor behaviour, achieving a specific capacitance of 1400.48 Fg<sup>−1</sup> at 1 Ag<sup>−1</sup>, significantly surpassing that of pristine MTC. When integrated into an asymmetric supercapacitor (ASC), the electrode delivered an energy density of 4 Wh kg⁻<sup>1</sup> at a power density of 800 W kg<sup>−1</sup> at 1 Ag<sup>−1</sup>, with good cycling stability. The synergistic interaction between PANI and MTC enhances dual functionality, improving electrical conductivity and increasing the electroactive surface area. These findings indicate that the MTC/PANI composite is a robust bifunctional material for both electrocatalytic water-splitting and high-performance energy storage applications.</p>

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Synergistic integration of manganese–titanium–cobalt oxide/polyaniline for hydrogen evolution reaction and supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Kaviya Ganesan,
  • Muthu Senthil Pandian,
  • Mohanraj Kumar,
  • Jeffery Joseph John Jeya Kamaraj,
  • Pavithra Suresh,
  • Meenatchi Thenappan,
  • Jih-Hsing Chang

摘要

Mixed transition metal oxides are promising candidates for energy conversion and storage owing to their high electrical conductivity and versatile redox behaviour. In this work, a manganese–titanium–cobalt oxide/polyaniline (MTC/PANI) composite was successfully prepared using a facile sonication-assisted approach. The phase, structural, and morphological characteristics of the synthesised materials were confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photon spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) analyses. Brunauer–Emmett–Teller (BET) analysis revealed the porous nature and surface properties. The excellent electrocatalytic performance towards the hydrogen evolution reaction (HER) in alkaline media is demonstrated by the MTC/PANI composite, with a current density of 10 mA cm−2 at an overpotential of 257 mV and a low Tafel slope of 158 mV dec−1. Moreover, the composite displayed remarkable supercapacitor behaviour, achieving a specific capacitance of 1400.48 Fg−1 at 1 Ag−1, significantly surpassing that of pristine MTC. When integrated into an asymmetric supercapacitor (ASC), the electrode delivered an energy density of 4 Wh kg⁻1 at a power density of 800 W kg−1 at 1 Ag−1, with good cycling stability. The synergistic interaction between PANI and MTC enhances dual functionality, improving electrical conductivity and increasing the electroactive surface area. These findings indicate that the MTC/PANI composite is a robust bifunctional material for both electrocatalytic water-splitting and high-performance energy storage applications.