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<p>In this study, a simple and low-cost green chemistry process was employed to synthesize mixed Bixbyite (Mn<sub>2</sub>O<sub>3</sub>) and Hausmannite (Mn<sub>3</sub>O<sub>4</sub>) nanopowder. It consists of a wet chemistry method using Olive Leaf Extract (OLE), whom bioactive constituting compounds, including polyphenols, act as complexing and reducing agents, promoting oxide nucleation, and followed by moderate annealing at 500&#xa0;°C, allowing co-crystal growth. The nanopowder was then deposited on a Conradty Nürnberg Noris D-type carbon (CND) substrate, forming a homogeneous well-adhered layer, and the electrochemical performance of the resulting electrode was evaluated toward supercapacitor application. Galvanostatic charge/discharge (GCD) and cyclic voltammetry (CV) analyses revealed outstanding capacitive performance. Specifically, high specific capacitance values of 552.4&#xa0;F g<sup>− 1</sup> (from CV at a scan rate of 5 mV s<sup>− 1</sup>) and 512.8&#xa0;F g<sup>− 1</sup> (from GCD at a current density of 4&#xa0;A g<sup>− 1</sup>) were measured. A good rate capability and stable cycling behavior with 91.84% retention were also observed. These results establish a clear correlation between the enhanced supercapacitive properties of the engineered electrode and its superior interfacial characteristics. Python-based multiphysics numerical modeling validated these issues, providing deeper insights onto their hybrid charge storage mechanism.</p> Graphical Abstract <p></p>

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A Combined Numerical and Experimental Study of Mn2O3-Mn3O4/CND Supercapacitor Electrodes Synthesized via a Green Chemistry Approach

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Nadjah Sobti,
  • Samiha Chaguetmi,
  • Khouloud Jlassi,
  • Assia Azizi,
  • Hana Bourahla,
  • Lynda Saci,
  • Sophie Nowak,
  • Souad Ammar

摘要

In this study, a simple and low-cost green chemistry process was employed to synthesize mixed Bixbyite (Mn2O3) and Hausmannite (Mn3O4) nanopowder. It consists of a wet chemistry method using Olive Leaf Extract (OLE), whom bioactive constituting compounds, including polyphenols, act as complexing and reducing agents, promoting oxide nucleation, and followed by moderate annealing at 500 °C, allowing co-crystal growth. The nanopowder was then deposited on a Conradty Nürnberg Noris D-type carbon (CND) substrate, forming a homogeneous well-adhered layer, and the electrochemical performance of the resulting electrode was evaluated toward supercapacitor application. Galvanostatic charge/discharge (GCD) and cyclic voltammetry (CV) analyses revealed outstanding capacitive performance. Specifically, high specific capacitance values of 552.4 F g− 1 (from CV at a scan rate of 5 mV s− 1) and 512.8 F g− 1 (from GCD at a current density of 4 A g− 1) were measured. A good rate capability and stable cycling behavior with 91.84% retention were also observed. These results establish a clear correlation between the enhanced supercapacitive properties of the engineered electrode and its superior interfacial characteristics. Python-based multiphysics numerical modeling validated these issues, providing deeper insights onto their hybrid charge storage mechanism.

Graphical Abstract