Various Graphene-Based Composites For an Efficient and Durable Supercapacitor*

Recently invented graphene and its astounding properties, such as very high theoretical surface area, excellent thermal conductivity, superior mechanical properties, and ultra-high electron mobility have led it to explore its widespread applications in electronics, optics, biomedicine, energy harvesting and storage. Electrochemical double layer capacitor also called as Supercapacitors have attracted a great attention due to its fast charging, instant power delivery and ability to sustain millions of charge-discharge cycles at higher current densities. Graphene, having very high surface area is the most suitable candidate for the efficient energy storage and low cost of production is another benefit for widespread commercialization. Here we present the variety of graphene-based structures/composites and their applications as a high-performance supercapacitor. Various metals and transition metal oxides (such as Au, TiO₂, cobalt oxides and Ni encapsulated CNT etc.) based composites with graphene are synthesized by hydrothermal/microwave methods and their potential applications as a supercapacitor will be discussed and described.