Studies on High Energy Density Reactions for Development of Nanostructured Hybrid Supercapacitors

Abstract : Nanocomposites of graphene or graphene oxide and either metal nanoparticles or macroporous copper oxides (macroCuO) were synthesized and their electrochemical properties and possible applications investigated. MacroCuO with graphene was successfully used as supercapacitor electrode material. Electrochemical measurements of this system revealed the maximum specific capacitance, energy density and power density of 417 F g(expn 1), 58 Wh kg(expn 1) and17.85 kWkg( expn -1), respectively at a current density of 0.9 Ag(expn -1). Graphene/silver nanoparticle/polypyrole modified glassy carbon electrode (Gr-AgNPs-PPy-GCE) was synthesized and its use as a supercapacitor electrode is under investigation. Graphene (Gr)- gold nanoparticles (AuNP)-Nafion and silver nanoparticle (AgNP)/graphene oxide (GO) composites have been successfully synthesized and characterized. These materials were investigated as supercapacitor electrodes with different electrolytes. AuNP-Nafion was found to be useful for sensing the pharmaceutical molecule Sumatriptan, and AgNP/GO shows high sensitivity in detection of Arsenic.