Study On The Synthesis Of Several Graphene-based Composites And Their Electrochemical Performance

Graphene is a surprised new carbon material owing large surface area, high eletrical conductivity and great mechanical flexibility. And it has been a most promising carbon allotrope attracted tremendous attention in many areas, such as energy storage, biomedicine and semiconductor. Our purpose includes designing straightforward ways for cotrolled synthesis of based on graphene nanocomposites and studying their electrochemical properties. The main works of this paper are described as follows:(1) We have successful obtained Cu/graphene and Cu2O/graphene nanocomposites under different reaction conditions, using CuO/GO as the precursor and ethylene glycol as both the solvent and reductant. The different graphene-based nanocomposites with various morphologies can be obtained in different reaction conditions. The approach to obtain graphene-based composites with different constituents is significant for the development of various graphene-based composites.(2) It is observed that the Mn02/GO composites have relatively high electrochemical resistances owing to their bad conductivity of each individual components. To enhance the conductivity, ethylene glycol was used to deoxynate the composites and named the resulting products MnOOH/graphene. The effect of reaction temperature, reaction time, and solvent were obvious. Contrast to Cs of Mn02/GO, MnOOH/graphene exhibits a better electrochemical propertities. Nevertheless, MnOOH/graphene did not possess great electrochemical properties due to their intrinsic weakness.(3) To obtain composites with high electrochemical properties, we proposed a one-step route to synthesize a Co3O4/Ni(OH)2/graphene composite, using Na2S as the reductant and the precipitant. We characterized the micro-structure of the composites and explored their formation process. And we also studied the effect of feeding ratio on the electrochemical propertities of the composites. The result showed that CNG2exhibited a highest Cs(1448F/g) which is much better than Co3O4/graphene and Ni(OH)2/graphene.