Electrochemical assessment of tailored Mn2O3 cuboidal hierarchical particles prepared using urea and Piperazine

• Published in: Electrochimica acta Vol. 507; p. 145169
• Main Authors: Dhakal, Alisha, Perez, Felio A, Mishra, Sanjay R
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10.12.2024
• Subjects: Electrochemical analysis; Hydrothermal synthesis; Mn2O3; Piperazine; Supercapacitor; Urea, X-ray diffraction; Supercapacitor; Electrochemical analysis; Mn2O3; Hydrothermal synthesis; Piperazine; Urea, X-ray diffraction
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2024.145169

This study synthesizes cuboidal-shaped hierarchical Mn2O3 (MNO) particles using a simple hydrothermal technique with Good's buffer piperazine and examines their electrochemical performance. The research explores how varying piperazine concentrations (piperazine concentration x in MNO-x) affect the structure and electrochemical properties of the MNO particles. X-ray diffraction (XRD) confirms the crystalline nature of MNO while scanning electron microscopy reveals that piperazine concentration influences the particles’ shape, size, and morphology. The MNO synthesized with 6 mmole piperazine (MNO-6) has the highest surface area of 8.67 m²/g. Electrochemical tests in 1 M and 6 M KOH electrolytes show that MNO-6 achieves the highest specific capacitance, with 440 F/g in 1 M and 952 F/g in 6 M KOH at a 1 mV/s scan rate. At a 1 A g-1 current density, MNO-6 exhibits a specific capacitance of ∼545.8 F/g in 1 M KOH and 809.0 F/g in 6 M KOH, with corresponding energy densities of 27.3 Wh/kg and 40.4 Wh/kg, and power densities of 315.7 W/kg and 365 W/kg, respectively. The superior electrochemical performance is attributed to the high surface area and porous structure of MNO synthesized with piperazine, highlighting its potential for advanced energy storage applications. [Display omitted]