Nickel-Cobalt-Sulfide for Supercapacitor Applications

Naskar, Ishita and Deepa, Melepurath (2019) Nickel-Cobalt-Sulfide for Supercapacitor Applications. Masters thesis, Indian institute of technology Hyderabad.

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Abstract

Nickel-cobalt-sulfide has been the highly probable electrocapacitive components for storing energy in electrical equipments, because of their maximum electrical conductivity and various and different oxidation states. Ni-Co-S crystals is synthesized by the hydrothermal method. Cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy (EIS) had been used to study the different electrochemical properties of Nickel-Cobalt-Sulfide, Carbon and Nickel-Cobalt-Sulfide@Carbon cloth structures. Electrochemical properties of Ni-Co-S, Ni-Co-S@Carbon cloth as supercapacitor electrodes were examined in 3 Molar Potassium Hydroxide electrolyte. The maximum Specific Capacitance of Nickel-Cobalt-Sulfide, Carbon and Nickel-Cobalt-Sulfide@Carbon cloth are 4000 F g-1, 4200 F g-1 at 5 A g-1 and 1400 F g-1 at 1A g-1 respectively. High energy densities of Nickel-Cobalt-Sulfide, Carbon and Ni-Co-S@Carbon cloth are 560 Wh Kg-1, 580 Wh Kg-1 and 190 Wh Kg-1 respectively. Highest Power Density of Nickel-Cobalt-Sulfide, Carbon and Nickel-Cobalt-Sulfide@Carbon cloth have been 12500W Kg-1, 8450 W Kg-1 and 5000 W Kg-1 respectively. These results demonstrate that the developed nickel-cobalt-sulfide crystals have encouraging utilizations in electrochemical supercapacitors

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