Binder free electrodeposition fabrication of NiCo2O4 electrode with improved electrochemical behavior for supercapacitor application

The supercapacitor is a ground-breaking energy storage device that has exploded in popularity in recent decades. The present study demonstrated a binder-free electrodeposition technique to produce NiCo(2)O(4 )for two different deposition times, namely 6 min (NC6) and 10 min (NC10). The cubic phase and purity of manufactured samples were validated by X-ray diffraction (XRD) patterns. Scanning Electron Microscopy (SEM) analysis revealed a flower-like arrangement in the NC6 sample and a sea-coral morphology in the NC10 sample. The electrochemical characteristics of NC6 and NC10 samples are tested using three-and two-electrode systems. The results showed that the NC6 sample had an extremely high specific capacitance value of 1472 F/g at 1.0 mV/s scan rate. The galvanostatic charge-discharge (GCD) study demonstrates that NC6 and NC10 have a rate-performance of 88.47 and 90.81% at a higher current density of 10.0 A/g, respectively. Outstanding cycle stability with 129% retention is observed for the two-electrode setup, which was 83% for NC6 and 81% for NC10 in the three-electrode system. The simple manufacturing method and outstanding performance of NiCo2O4 electrodes open-up new opportunities in the field of energy.

Automated summary

The present study demonstrates a binder-free electrodeposition technique to produce NiCo(2)O(4) electrodes, which exhibit high specific capacitance and good cycle stability. The results open up new possibilities for the practical application of NiCo2O4 as an energy storage material.