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Composites of a nickel based compound incorporated with graphene sheets(NiBC-GS) are prepared by a simple flocculation,using hydrazine hydrate as flocculant and reductant,from a homogeneous intermixture of nickel dichloride and graphene oxide dispersed in N,N-dimethylformamide.Morphology,microstructure and thermal stability of the obtained products were characterized by field-emission scanning electron microscopy,X-ray diffraction and thermal gravimetric analysis.Furthermore,the electrochemical properties of NiBC-GS,as electrode materials for supercapacitors,were studied by cyclic voUammetry and galvanostatic charge/discharge in 2 mol L~(-1) KOH solution.It was determined that for NiBC-GS annealed at 250 ℃.a high specific capacitance of 2394 Fg~(-1) was achieved at a current density of 1 Ag~(-1),with 78%of the value(i.e.,1864 Fg~(-1)) retained after 5000 times of repeated galvanostatic charge/discharge cycling.The high specific capacitance and available charge/discharge stability indicate the synthesized NiBC-GS250 composite is a good candidate as a novel electrode material for supercapacitors.
Composites of a nickel based compound incorporated with graphene sheets (NiBC-GS) are prepared by a simple flocculation, using hydrazine hydrate as flocculant and reductant, from a homogeneous intermixture of nickel dichloride and graphene oxide dispersed in N, N-dimethylformamide. Morphology, Microstructure and thermal stability of the obtained products were characterized by field-emission scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. Fürthermore, the electrochemical properties of NiBC-GS, as electrode materials for supercapacitors, were studied by cyclic voUmmetry and galvanostatic charge / discharge in 2 mol L -1 KOH solution. It was determined that for NiBC-GS annealed at 250 ° C. A high specific capacitance of 2394 Fg -1 was achieved at a current density of 1 Ag ~ (-1), with 78% of the value (ie, 1864 Fg -1) retained after 5000 times repeated galvanostatic charge / discharge cycling. The high specific capacitance and available charge / discharge stability ind icate the synthesized NiBC-GS250 composite is a good candidate as a novel electrode material for supercapacitors.