Optical and electrochemical performance of electrospun NiO–Mn3O4 nanocomposites for energy storage applications
Zahra Shoghi Doroudkhani, J. Mazloom, M. Mahinzad Ghaziani
Abstract
NiO–Mn 3 O 4 ribbons were synthesized through electrospinning and subsequently compared with NiO nanoparticles and Mn 3 O 4 octahedral particles to evaluate their optical and electrochemical properties. XRD analysis confirmed the presence of cubic and tetragonal phases of NiO and Mn 3 O 4 , respectively, within the nanocomposite. UV–Vis diffuse reflectance spectroscopy (DRS) revealed a bandgap of 3.53 eV for the nanocomposite, while photoluminescence emission quenching indicated an enhancement in surface defects. The ribbons exhibited superior electrochemical performance, achieving a specific capacitance of 372 F g −1 at a current density of 1 A g −1 , along with 94% capacitance retention after 3000 cycles at 7 A g −1 . Furthermore, the assembled NiO–Mn 3 O 4 //AC asymmetric supercapacitor device exhibited a maximum energy density of 40 Wh kg −1 at a power density of 2400 W kg −1 . These findings suggest that NiO–Mn 3 O 4 ribbons hold significant promise for high-performance energy storage devices.