ZIF-67 Derived Co3S4/WO3 Composites as a Negative Electrode for Hybrid Supercapacitor Application

The new approach to synthesize porous Co
3
S
4
nanoparticles derived from ZIF-67 polyhedrons decorated with WO
3
rectangular sheets is demonstrated. Furthermore, the composite material is employed as a negative electrode for high energy density supercapacitor application. The one pot hydrothermal treatment of ZIF-67 with WO
3
precursor give the Co
3
S
4
/WO
3
composites. The obtained samples are evaluated with cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy tests. The composites delivered the highest specific capacitance of 668 F/g at the current density of 1 A/g in 1 M H
2
SO
4
electrolyte. Addition to this, the composite material remains stable upto 2000 cycles of charging/discharging cycles with 94% capacitance retention. The excellent electrochemical performance is attributed to the synergy between the sheet like WO
3
structure and Co
3
S
4
nanoparticles. The positive electrochemical results of the composites demonstrate its potential or practical hybrid supercapacitor application.