Nanocomposites of metal oxide@graphene@Ni foam have been developed for energy storage applications such as supercapacitors. Electrochemical performance of the graphene-based metal compounds nanocomposites has been improved due to the synergistic effect of excellent conductivities and mechanical properties of graphene sheets and the high pseudocapacitance of metal oxides and metal sulfides. Most metal oxides and sulfides are low costs and doping of graphene with metal oxide or sulfide nanoparticles enhances the energy density remarkably, resulting in an excellent performance as an electrode material for supercapacitors. Recently, metal foam has been getting tremendous attention as it provide a large surface area and large pores that enables electrolytes and charges penetrates freely. However, to meet the demands of industry for higher capacitance, energy density and power density, a new approach is required.

Various metal oxides and sulfides will be compared. The benefits of using graphene will also be discussed. In the synthesis of these materials, a cleaner technology has been employed. Nanocomposites that show high surface areas, high conductivities, and remarkable electrochemical properties will be introduced and, especially, materials for high performance supercapacitors will be presented for future energy storage application.