Abstract
Transition metal oxide nanostructures and conducting polymers like polyaniline have specific capacitance orders of magnitude higher than those of carbon based nanomaterials. In the present study nanoflowers of Cobalt Hydroxide, Polyaniline and Carbon Nanotubes were combined on a conventional Polymeric sponge to develop by using facile wet chemical techniques. High surface area of Cobalt Hydroxide nanoflowers when combined with Polyaniline showed enhanced capacitance values and stability. The carbon nanotubes enhanced the conductivity of the composite while the double porous structure of polyurethane sponge enhances the electrolyte flow, surface area, and reduces current density which leads to good reversibility and greater capacitance. Samples were characterized by cyclic voltammetry technique against Ag/AgCl reference electrode in three electrode setup.
Highlights
Super-capacitors are an attractive class of energy storage devices which have potential to replace batteries
There are two mechanisms involved in energy storage in them i.e. electric double layer effect and pseudo-capacitive effect [1,3]
To circumvent problems posed by oxides and overcome deficiencies discussed above, we investigate a quaternary composite of MW carbon nanotubes, Polyaniline and in-situ grown cobalt hydroxide nanowires on a polymer sponge as a potential electrode material for super capacitors
Summary
Super-capacitors are an attractive class of energy storage devices which have potential to replace batteries. Many groups have formulated composites of oxides, conducting polymers, and carbon based materials to meet the required applications such as; manganese dioxide/activated carbon based super-capacitor was made by Yuan et al using lithium hydroxide as electrolyte and obtained 62.4 F/g [7], Sen et al combined manganese dioxide nanorods with polyaniline and PEDOT to obtain capacitance of 221 F/g and 315 F/g respectively [8], Zhu et al combined polyaniline nano fibers with graphite oxide via interfacial polymerization and obtained energy density of 7.1 Wh/kg and a power density Cobalt Hydroxide is an important class of material used in energy storage because it has very high theoretical capacitance of 3458 F/g.
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