Aloe Vera-Assisted Synthesis of MnCo 2 O 4 as a Battery-Type Material for Hybrid Supercapacitor Applications

Abstract

Material advancement in sustainable energy storage is increasingly driven by green chemistry approaches. In this context, we have investigated an Aloe vera-mediated synthesis route for MnCo 2 O 4 nanostructures as a battery-type electrode material for hybrid supercapacitor applications. The material was synthesized via an eco-conscious, biogenic route using Aloe vera gel as a natural reducing and stabilizing agent. High-resolution synchrotron XRD and TEM analyses confirmed the formation of single-phase spinel nanocrystals with an average size of ~12.7 nm, while FESEM revealed aggregated mesoporous clusters indicative of secondary particle formation. BET analysis demonstrated a moderate specific surface area of 43.27 m 2 g -1 and a dominant pore size around 10 nm, supporting rapid ion transport and efficient electrolyte access. XPS spectra revealed the coexistence of Mn 3 ⁺/Mn 4 ⁺ and Co 2 ⁺/Co 3 ⁺ oxidation states, along with abundant oxygen vacancies and/or oxygen interstitials, collectively contributing to enhanced redox kinetics and charge storage capability. The material exhibited excellent electrochemical performance, delivering a high specific capacitance of 680 F g -1 at 1 A g -1 and retaining 282.7 F g -1 even at 80 A g -1 and 365.7 F g -1 at high scan rate of 200 mV s -1 . Furthermore, it showed remarkable long-term stability. These findings establish the Aloe vera-derived MnCo 2 O 4 as a green-engineered, high-rate capable, and durable electrode material for hybrid supercapacitor applications.

Article information

Article type
Paper
Accepted
17 Oct 2025
First published
17 Oct 2025
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2025, Accepted Manuscript

Aloe Vera-Assisted Synthesis of MnCo 2 O 4 as a Battery-Type Material for Hybrid Supercapacitor Applications

M. Bhatt, K. Gautam and A. K. Sinha, Mater. Adv., 2025, Accepted Manuscript , DOI: 10.1039/D5MA01005E

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