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<p>The solvothermal method was used to synthesize the Mn<sub>2</sub>Se<sub>3</sub> nanomaterial, which was prepared using manganese acetate tetrahydrate, selenium dioxide, and triethanolamine (TEA) as complexing agents. The synthesis of a novel&#xa0;Mn–Se-based compound was revealed by XRD analysis. The average crystallite size was 38&#xa0;nm. XPS analysis identified Mn<sup>3+</sup> and Se<sup>2−</sup> states, confirming the Mn<sub>2</sub>Se<sub>3</sub> phase. FTIR spectra were used to confirm that the synthesized nanomaterial included metals and functional groups. Optical characterization revealed a band gap of 1.63&#xa0;eV, with low transmittance in the UV region, moderate in the visible region, and high in the IR region. HRTEM confirmed the existence of ultrathin nanosheets with a surface area of 4.826 × 10<sup>5</sup> nm<sup>2</sup> and lateral dimensions of 100–200&#xa0;nm, while the lattice fringes and SAED patterns indicated a polycrystalline nature. The FESEM images show a mixed arrangement of nanosheets and rod-like structures embedded inside the clusters. The elemental compositions of Mn and Se were confirmed by EDS analysis. The Mn<sub>2</sub>Se<sub>3</sub> nanomaterial electrode demonstrated a boosted specific capacitance of 777, 783, 791, and 129&#xa0;Fg<sup>−1</sup> at scan rates of 5, 10, 20, and 100&#xa0;mV/s, respectively, in aqueous 0.1&#xa0;M KOH solution, and from the 100th to the 900th cycle, the cyclic stability remained at 100% retention. At the 1000th cycle, the capacitance gradually reduced (retaining 88.46% of the initial capacitance), and by the 1500th cycle, it dropped to 100 F/g (5.82% retention). Additionally, it demonstrated an improved mid-term cycle stability performance with a higher specific capacitance of 1716.81 F/g, power density of approximately 357 W/kg and energy density (1.991 × 10<sup>–4</sup> Wh/Kg), and higher electrochemically active surface area (8.7212 cm<sup>2</sup>). These results indicate that Mn<sub>2</sub>Se<sub>3</sub> is a promising electrode material for future energy storage applications and high-performance supercapacitors.</p>

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A study of electrochemical performance of Mn2Se3 nanomaterial as an electrode for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • M. Affrin Nighar,
  • J. Joy Jeba Vijila

摘要

The solvothermal method was used to synthesize the Mn2Se3 nanomaterial, which was prepared using manganese acetate tetrahydrate, selenium dioxide, and triethanolamine (TEA) as complexing agents. The synthesis of a novel Mn–Se-based compound was revealed by XRD analysis. The average crystallite size was 38 nm. XPS analysis identified Mn3+ and Se2− states, confirming the Mn2Se3 phase. FTIR spectra were used to confirm that the synthesized nanomaterial included metals and functional groups. Optical characterization revealed a band gap of 1.63 eV, with low transmittance in the UV region, moderate in the visible region, and high in the IR region. HRTEM confirmed the existence of ultrathin nanosheets with a surface area of 4.826 × 105 nm2 and lateral dimensions of 100–200 nm, while the lattice fringes and SAED patterns indicated a polycrystalline nature. The FESEM images show a mixed arrangement of nanosheets and rod-like structures embedded inside the clusters. The elemental compositions of Mn and Se were confirmed by EDS analysis. The Mn2Se3 nanomaterial electrode demonstrated a boosted specific capacitance of 777, 783, 791, and 129 Fg−1 at scan rates of 5, 10, 20, and 100 mV/s, respectively, in aqueous 0.1 M KOH solution, and from the 100th to the 900th cycle, the cyclic stability remained at 100% retention. At the 1000th cycle, the capacitance gradually reduced (retaining 88.46% of the initial capacitance), and by the 1500th cycle, it dropped to 100 F/g (5.82% retention). Additionally, it demonstrated an improved mid-term cycle stability performance with a higher specific capacitance of 1716.81 F/g, power density of approximately 357 W/kg and energy density (1.991 × 10–4 Wh/Kg), and higher electrochemically active surface area (8.7212 cm2). These results indicate that Mn2Se3 is a promising electrode material for future energy storage applications and high-performance supercapacitors.