Hybrid Mesoporous Mn2O3/Carbon as Electrode Materials for Supercapacitors

Document Type

Article

Publication Date

2026

Abstract

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.

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