Facile synthesis of CuMn2O4 nanoparticles for efficient of high performance electrode materials for supercapacitor application

Copper manganese oxides (CuMn2O4) were prepared through the sol-gel auto-combustion methods followed by different calcination temperatures. Further, these materials were characterized by the surface analytical techniques such as TG-DTA, XRD, FE-SEM, FTIR, XPS, and BET. Additionally, the multifunctional properties of these nanoparticles (NPs) were evaluated in terms of their magnetic, dielectric, and electrochemical behavior. Structural XRD reveals the spinel formation of CuMn2O4 NPs orientation along with (211) plane tetragonal structure and space group I41/amd (141). XRD shows the increasing nature of crystallite size -32-40 nm with calcination temperatures. Molecular vibrational by FTIR study shows two metal-oxygen bonds -605 and 517 cm- 1 attributed to tetrahedral and octahedral sides. The XPS oxidation studies of metallic species Cu2+ and Mn2+. The NPs depicts the ferromagnetic behaviour from the hysteresis-loop. The dielectric exhibit improved AC conductivity with increasing frequency. Electrochemical of CuMn2O4 NPs as working electrode showed an enhanced specific capacitance of 822 F g-1 at a current density of 1 A g-1. The electrochemical stability of the CuMn2O4 electrode material provided a good Coulombic efficiency of around 91%, even after 5000 cycles. The high energy and high power density of 18.2 W hkg- 1 and 1125 W kg- 1, respectively, make the CuMn2O4 NPs an effective material for supercapacitor applications.