Polymer Modiifed Graphene And Studies Of Their Electrochemical Behavior

Graphene (GR) have a great prospect in the area of electronic electricbattery, biomaterial, and especially in the area of supercapacitor, due to theirlarge specific surface area, extraordinary mechanical, thermal and electricalconductive properties. But the defects of their dispersion have lead to a greatlimitation to the development and application. The poor dispersion ofgraphene in most solvents caused a difficulty in processing ability, and theexcellent properties of few layers graphene cannot show in the composites.How to obtain good dispersion graphene and better electrical conductiveproperty is a challenge. In this paper, we chosen water-soluble polymer(PSSS) and conductive polymer (PANi) modified GR, and studied theirstructure and capacitance characteristics.Firstly, graphene was successful modified with water-solubilitypolymer (PSSS) using the covalent grafting polymerization. The results haveshown that the water-solubility is6mg/mL and the rate of grafting is90%.Electrochemical test has shown that the electroactive property of themodified graphene (PSSS-GR) was enhanced greatly. Under the differentcurrent density, PSSS-GR supercapacitor shown good rate characteristics,and the specific capacitance was enhanced greatly.Then graphene was successful modified with conductive polymer (PANi)using the covalent grafting polymerization, due to the the characterizationresult. The electrochemical test has shown that the capacitance of PANi-GRsupercapacitor was much higher than that of GR supercapacitor.