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<p>A new α-Mn<sub>2</sub>O<sub>3</sub>/carbon (Mn<sub>2</sub>O<sub>3</sub>/C) nanocomposite was synthesised via ultrasonication-assisted co-precipitation, calcination, and freeze-drying. The method involved forming a stable Mn–citrate precursor, which, upon calcination, yielded crystalline α-Mn<sub>2</sub>O<sub>3</sub> embedded in a carbonaceous matrix. Structural investigations using FT-IR, XRD, and FE-SEM validated the development of a porous nanosheet morphology, with well-dispersed Mn<sub>2</sub>O<sub>3</sub> nanocrystals closely integrated within a carbon matrix. The hierarchical porosity and graphitic domains improved ionic accessibility and charge transfer at the oxide-carbon interface. Electrochemical investigations revealed significant pseudocapacitive characteristics accompanied by Mn redox shifts. The Mn<sub>2</sub>O<sub>3</sub>/C electrode achieved a specific capacitance of 1700&#xa0;F g<sup>− 1</sup> at 0.5&#xa0;A g<sup>− 1</sup> in a 6&#xa0;M KOH electrolyte. It maintains 94% of its efficiency after 5000 cycles, indicating high recyclability. The synergistic integration of Mn<sub>2</sub>O<sub>3</sub> and Carbon in Mn<sub>2</sub>O<sub>3</sub>/C, along with its structural integrity and effective ion/electron transport, renders the material promising for supercapacitors.</p> Graphical Abstract <p></p>

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Hybrid Mesoporous Mn2O3/Carbon as Electrode Materials for Supercapacitors

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Islam Gomaa,
  • K. S. Al-Namshah,
  • Hani Nasser Abdelhamid

摘要

A new α-Mn2O3/carbon (Mn2O3/C) nanocomposite was synthesised via ultrasonication-assisted co-precipitation, calcination, and freeze-drying. The method involved forming a stable Mn–citrate precursor, which, upon calcination, yielded crystalline α-Mn2O3 embedded in a carbonaceous matrix. Structural investigations using FT-IR, XRD, and FE-SEM validated the development of a porous nanosheet morphology, with well-dispersed Mn2O3 nanocrystals closely integrated within a carbon matrix. The hierarchical porosity and graphitic domains improved ionic accessibility and charge transfer at the oxide-carbon interface. Electrochemical investigations revealed significant pseudocapacitive characteristics accompanied by Mn redox shifts. The Mn2O3/C electrode achieved a specific capacitance of 1700 F g− 1 at 0.5 A g− 1 in a 6 M KOH electrolyte. It maintains 94% of its efficiency after 5000 cycles, indicating high recyclability. The synergistic integration of Mn2O3 and Carbon in Mn2O3/C, along with its structural integrity and effective ion/electron transport, renders the material promising for supercapacitors.

Graphical Abstract