Abstract:
Advanced energy storage solutions just like supercapacitors (SCs) have been developed to
meet the increasing energy demands of the modern world. Hybrid metal chalcogenides
have drawn considerable interest as electrode active materials for their application in
supercapacitors, owing to their rich redox chemistry, layered structure, fast ion diffusion
properties, various oxidation states, and versatile morphology. In this study, we have
demonstrated the synthesis of NiCoSe2 hybrid nanocomposite with the different variation
of NiAl-LDH nanosheets by using hydrothermal synthesis route for the first time with
desirable structure and then employed NAL@NCS as the best ratio composite electrode
for supercapacitor application. NAL@NCS hybrid nanocomposite grown on a Ni-foam
displayed a high specific capacitance 1092 F g-1 at a current density 0.5 A g-1
. The study
further delved into the reaction mechanism through XRD, FTIR, and SEM. A larger surface
area facilitated the penetration of charges in the nanosheets to enhance the electrochemical
properties. In addition, the NAL@NCS was used as a positive electrode with activated
carbon (AC) as a negative electrode to construct the asymmetric supercapacitor device.
Due to the synergetic effect, the NAL@NCS||AC device demonstrated a specific
capacitance of 674 F g-1 at the current density of 1 A g-1
, had an energy density of 304 W
h Kg-1
at the power density of 3.42 kW Kg-1
. The device represented exceptional stability
of 82% retention after 10000 cycles at a current density of 30 A g-1
. This was mainly due
to increased electrochemical surface area and sufficient electron transfer rate in
NAL@NCS nanocomposite. This study indicates that the prepared NAL@NCS hybrid
nanocomposite is a promising candidate for the supercapacitor practical application.
