Thermal nanoarchitectonics with NiMn2O4 binary nanocomposite as a superior electrode material for the fabrication of high performance supercapacitors

Herein, we report the NiMn2O4 (NMO), a supercapacitor electrode based on the binary metal nanocomposite which was synthesized using facile combustion method varying its annealing temperature. The X-ray diffraction (XRD) pattern reveals the formation of cubic structured NMO NCs with high crystallinity. The cube shaped morphology of NMO NCs and their decreasing particle size with increasing temperature were visualized by Field Emission Scanning Electron Microscope (FE-SEM). Moreover, the cyclic voltammetry (CV) analysis demonstrates the pseudo capacitive behavior of NMO-3 NCs and evaluated its high specific capacitance of 82.24F/cm(2) at 5 mV/s. The electrochemical impedance spectra (EIS) of NMO1, NMO2, and NMO3 NCs exhibit low solution resistance (R-s) of 3.04, 1.87, and 3.53 omega respectively and low charge transfer resistance (R-ct) of 65.2, 75.8 and 74.2 omega respectively. The cyclic stability of NMO3 NC delivers superior capacitive retention of about 81.96 % even after 3000 cycles. Thus the obtained results revealed that, the proper optimization of synthesis condition could potentially enhance the performance of active materials.

Automated summary

In this study, a supercapacitor electrode NiMn2O4 (NMO) based on binary metal nanocomposite was synthesized using a facile combustion method and optimized by varying the annealing temperature. X-ray diffraction and field emission scanning electron microscopy were used to analyze the structure and morphology of the NMO nanocrystals. The cyclic voltammetry and electrochemical impedance spectroscopy results showed the pseudo capacitive behavior and excellent electrochemical performance of the optimized NMO nanocrystals.