Porous Mn₂O₃ nanorods-based electrode for high-performance electrochemical supercapacitor

In this research, we introduce an effective electrode material, i.e. porous manganese oxide (Mn₂O₃) nanorods (NRs) prepared by simple hydrothermal process, designed for use in electrochemical supercapacitors. XRD analysis unequivocally confirms that the Mn₂O₃ NRs possess a pure cubic crystalline structure with an Ia₃ space group, indicating the high degree of crystallinity and phase purity. Morphological examinations confirmed that the Mn₂O₃ NRs display a distinct rod-like structure, featuring an average size of around 30 nm, underscoring their nanostructured characteristics. The electrochemical performance of the synthesized Mn₂O₃ NRs as electrodes for supercapacitors was thoroughly examined, resulting in an impressive specific capacitance of 483 F/g at a scan rate of 10 mV/s. Electrochemical impedance spectroscopy (EIS) analysis was carried out to assess the effective series resistance (ESR), revealing a minimal resistance value of 3.2 Ω, highlighting excellent charge transfer kinetics. Mn₂O₃ NRs electrode displayed exceptional capacitance retention even after undergoing 500 charge–discharge cycles at a high current density of 5 A/g, indicating their remarkable chemical stability as an electrode material. This study introduces a promising and scalable approach for the development of high-performance supercapacitors, with Mn₂O₃ NRs as a critical component, and offers valuable insights into the design and engineering of advanced energy storage devices.