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<p>MnCo<sub>2</sub>O<sub>4</sub>@g-C<sub>3</sub>N<sub>4</sub>/BC nanocomposites were synthesized via a green, solvothermal method and characterized using SEM, XRD, Raman, and XPS. Electrochemical analyses [cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and equivalent series resistance (EIS)] revealed that particle size significantly affects the electrochemical performance. The electrochemical evaluations revealed a dominant electric double-layer capacitance (EDLC) behavior for the 2&#xa0;h and 16&#xa0;h samples, while the 4&#xa0;h and 8&#xa0;h samples exhibited predominantly pseudocapacitive (Faradaic) behavior. The 8&#xa0;h sample demonstrated the better performance than others. These findings indicate that electrochemical behavior is size-dependent, b-value and primarily influenced by the Mn<sup>3+</sup>/Mn<sup>4+</sup> redox couple, positioning these nanocomposites as promising candidates for high-performance supercapacitors.</p> Graphical abstract <p></p>

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Size-dependent electrochemical behavior of green synthesized MnCo2O4@g-C3N4/BC nanocomposites for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Seynabou Mbodj,
  • El Hadji Mamour Sakho,
  • Makha Ndao,
  • Ndeye Maty Ndiaye,
  • Astou Seck,
  • Ncholu Manyala,
  • Abdoulaye Djire,
  • Abdou Karim Diallo,
  • Caroline Rosemyya Kwawu,
  • Balla Diop Ngom

摘要

MnCo2O4@g-C3N4/BC nanocomposites were synthesized via a green, solvothermal method and characterized using SEM, XRD, Raman, and XPS. Electrochemical analyses [cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and equivalent series resistance (EIS)] revealed that particle size significantly affects the electrochemical performance. The electrochemical evaluations revealed a dominant electric double-layer capacitance (EDLC) behavior for the 2 h and 16 h samples, while the 4 h and 8 h samples exhibited predominantly pseudocapacitive (Faradaic) behavior. The 8 h sample demonstrated the better performance than others. These findings indicate that electrochemical behavior is size-dependent, b-value and primarily influenced by the Mn3+/Mn4+ redox couple, positioning these nanocomposites as promising candidates for high-performance supercapacitors.

Graphical abstract