Synthesis Of Carbonaceous Composites And Its Application In Supercapacitors Electrodes

Supercapacitor has attracted attention for the past few years. Due to its good electrical conductivity, large specific area and long life, supercapacitor has been honored as a new promising energy storage device. There are several materials for electrodes, such as carbon, metal oxide, metal sulfide and conductive polymer. Besides low capacitance, carbon materials have large specific area, stable cycle performances and good conductive properties. Metal oxides and metal sulfides show higher capacitances but bad cycle properties. So this paper introduces a material compsited by carbon and Metal oxides(sulfides).Here, the Nickel/Carbon(Ni/C) material is used instead of pure carbon material; it is a smooth nanorod with nickel wrapped by carbon. The Nickel element is used directely to form metal oxides(sulfides). There are two different materials formed by Ni/C:(1) The C/NiO/NiCo2O4/Co3O4 composite is fabricated by adding different amount of CoCl2·6H2O. With the increasing quantity of CoCl2·6H2O, the material shows higher capacitance(up to 975 F/g at 1 A/g). And the capacitance remains 79% after 1000 cycles.(2) The NiCo2S4/C composite is produced by a different method comparing with(1). The hydrogen peroxide is added to form the precursor. Then the composite is contrasted with another sample(without H2O2). The two samples show different SEM images and electrochemical performance. The sample without H2O2 shows excellent cycle properties(nearly no loss of capacitance), while the sample with H2O2 shows better capacitance(1200 F/g at 20 A/g).