Synthesis and characterization of binary transition metal oxide reduced graphene oxide nanocomposites for energy storage and conversion applications

Abstract

Supercapacitor and fuel cell plays an important role in excellent electrochemical energy storage and conversion devices Among different types of nanocomposites the graphene-based metal oxides nanocomposites have multiple advantages such as high energy density and good cyclic stability higher electron conductivity environmental friendliness and low cost etc Hence when it is compared to other nanostructured materials the combination of transition metal oxide and graphene oxide nanocomposites has multipurpose applications such as Li-ion batteries metal-air batteries sensors solar cell fuel cell and supercapacitors In future there may be huge demand for advanced electrode materials owing to increase in the basic needs of peoples Nanomaterials are the promising material to achieve great performance by means of short ionic diffusion length and providing high surface areas for electrode reactions Supercapacitors exhibit significant characteristics such as high power density 1000 2000 Wkg-1 and long cycle life 100000 etc Based on the energy storage mechanism supercapacitor are classified as electrical double layer EDLC capacitors a commonly known capacitors with high surface reactivity and store energy through accumulation of charge between the electrode-electrolyte interfaces Carbon materials are widely considered EDLC material because of its higher specific surface area extraordinary conductivity excellent thermal stability and outstanding corrosion resistant to electrolyte Another category of SC shows faradaic electrochemical reactions occurring on the surface pseudocapacitors The conducting polymers PVDF PAn and metal oxide MnO2 RuO2 SnO2 CuO Co3O4 V2O5 ZnO and NiO based materials are suitable for pseudocapacitors newline