Synthesis of Co₃S₄ Nanosheets and Their Superior Supercapacitor Property

Sheet-like Co₃S₄ nanomaterial with high purity was synthesized via a facile and easily controlled one-step hydrothermal route. The structure and morphology of the as-synthesized sample was characterized by x-ray diffraction, transmission electron microscopy, and field emission scanning electron microscopy, respectively. The Co₃S₄ nanosheets with a mean size of 10 nm or so were used as electrode material and the supercapacitor property was determined. The results show that the specific capacitance of the Co₃S₄ nanosheets reaches 1037 F/g at 1 A/g. After 3000 charge-discharge recycles, the remained specific capacitance of the supercapacitor is 978 F/g, which is 94.3% of its initial value. The experiments indicate that the Co₃S₄ supercapacitor possesses high specific capacitance and excellent cyclic stability, which suggests its potential application in supercapacitor.