What question did this study set out to answer?

This research aims to optimize the synthesis of manganese oxide nanostructures for enhanced electrochemical performance.

June 19, 2026

Strategic Mass Optimization of MnO 2 Nanostructures Synthesized via Coprecipitation: A Response Surface Methodology (RSM)-Guided Electrochemical Study

Key Points

This research aims to optimize the synthesis of manganese oxide nanostructures for enhanced electrochemical performance.
Synthesis of manganese oxide nanostructures via coprecipitation using MnCl2·4H2O and KMnO4.
Optimization of precursor concentration, calcination temperature, and reaction time using Response Surface Methodology (RSM) with Box-Behnken design.
Characterization techniques including XRD, FTIR, SEM, and EDX to analyze structural properties.
Optimized ε-MnO2 (TB2) shows a specific capacitance of 113.996 F/g at 10 mV/s and an areal capacitance of 317.84 mF/cm² at 0.5 A/g.
Achieved a maximum energy density of 2.4 W h/kg at a power density of 372.40 W/kg.
After 200 cycles, capacitance retention of 78.3% and Coulombic efficiency of 112% maintained.

Abstract

Manganese oxide (MnO 2 ) nanostructures (NSs) were synthesized via a coprecipitation method using MnCl 2 ·4H 2 O and KMnO 4 precursors. The effects of precursor concentration, calcination temperature, and reaction time were systematically optimized using Response Surface Methodology (RSM) based on a Box-Behnken design (BBD). Analysis of variance (ANOVA) identified calcination temperature and reaction time as a key factor governing the electrochemical response. Structural characterization (XRD and FTIR) confirmed the formation of ε-MnO 2 (akhtenskite) as the dominant phase, while SEM and EDX verified the morphology and elemental composition. BET analysis revealed a high surface area for the optimized TB2 sample (ε-MnO 2, 156.82 m 2 g –1 ). Electrochemical measurements (CV, GCD, and EIS) demonstrated superior performance for the optimized TB2 electrode, synthesized with 2 g KMnO 4, and calcined at 200 °C for 3 h. It delivered a specific capacitance of 113.996 F/g at 10 mV s –1 and an areal capacitance of 317.84 mF cm –2 at 0.5 A g –1 . A maximum energy density of 2.4 W h kg –1 (11.04 mW h cm –2 ) was achieved at a power density of 372.40 W kg –1 (1787.5 mW cm –2 ). After 200 cycles, it retained 78.3% capacitance retention and 112% Coulombic efficiency were maintained, highlighting the potential of ε-MnO 2 NSs for advanced energy storage applications.

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