Direct electrodeposition of ternary transition metal
sulfides is
extremely imperative, yet challenging. Here, we report a one-step
potentiostatic electrodeposition procedure of CuCo2S4-nanostructured electrode materials as high-performance faradaic
supercapacitor cathodes. The morphological evolution was carried out
systematically as an effect of the surfactant additive in the electrodeposition
process, resulting in exclusive control of the morphology as nanoplates
(without surfactant) and nanotubes (with surfactant). To circumvent
the difficulties of the hard template synthetic route, here we adopted
electrodeposition to design CuCo2S4 nanotubes,
where surfactants act as soft templates. Besides, the hydrogen gas
bubbles generated during the electrodeposition process adjusted the
surface electronic structure by creating a significant porous nature,
which acts as a reservoir for ion/electron transportation and storage
during redox processes. The surface and structural factors of as-fabricated
CuCo2S4 metal nanoplates (CCS-1) and nanotubes
(CCS-2) were analyzed thoroughly, ensuring their high crystalline
nature, attractive morphological phenomena, and increased surface
area. The preliminary electrochemical tests of CCS-2 and CCS-1 electrodes
in an aqueous medium (3 M KOH) as a faradaic electrode material provided
specific capacities of 1199 and 639 C g–1 at 10
A g–1 current density, respectively. Despite the
high applied current density value of 30 A g–1,
CCS-2 and CCS-1 showed retention values of 83.17 and 72.31% for 5000
cycles, respectively. The superior-functioning CCS-2 electrode was
used as a cathode in constructed asymmetric supercapacitor (ASC) device
assembly, which delivered 360.27 C g–1 at 10 A g–1 and a reserved capacity value with 95.23% retention
while cycling at 30 A g–1 current density over 5000
charge/discharge cycles. The very minimal interfacial resistance (Rs
= 0.334 and Rct = 5.461) and relaxation time (0.409 s) values were
observed for fabricated ASCs with a CCS-2 cathodic material, expressed
at an increased energy density and power density value of 164.52 Wh
kg–1 (at 10 A g–1) and 46.37 kW
kg–1 (at 30 A g–1), respectively.