Abstract:
In this thesis, “Characterization and performance evaluation of electrodeposition
synthesized cobalt-nickel layered double hydroxide and composites for high-efficiency
hybrid capacitor applications”, an efficient binder-free electrodeposition process was used
to prepare cobalt nickel layered double hydroxide and its composites. Cobalt nickel layered
double hydroxide (CN-LDH) benefits from a unique 2D layered structure with large
interlayer spacing for ion transport. However, it suffers from restacking of layers leading to
low electrical conductivity. Sulphur reduced graphene oxide increases mechanical strength,
electrical conductivity, and wettability, while Hausmannite, manganese cobaltite and
chromite improves the redox active capability and ion diffusion to improve the
electrochemical performance of CN-LDH. The asymmetric supercapacitors fabricated using
CN-LDH composites as positive electrodes and activated carbon as negative electrodes,
exhibited excellent specific energy and power ranging from 55.8 to 80.2 W h kg -1 and 515 to
1117.7 W kg -1 , respectively, in 2 M KOH electrolyte within a cell voltage of 1.65 V.
