The Study Of BC/PANI Used As Supercapacitor Electrode Material

Since entering the 21st century, coal,oil and other nature energy shortage problem become more and more serious. Energy and sustainable development are attracting much attention. Supercapacitor which possesses large specific energy,higher power density and long cycle life is a hot research area now.Bamboo has high growing speed and output, low production cost. Its carbonized product bamboo carbon(BC) has advantage of no pollution, high electric conductivity and steady charge-discharge property used as supercapacitor electrode material. But its specific capacitance is not high. Polyaniline(PANI) shows high theoretical specific capacitance, But it has high electric resistance, cycle instability. This paper takes advantage of BC and PANI and prepared BC/PANI composite material which has commercial value. At the same time its laying a foundation for research of composite BC matrix carbon and conductive polymer.In this paper, BC/PANI composite is prepared by three kinds of method:chemical oxidation polymerization,micromulsion polymerizati- ion and dynamic interfacial polymerization. BC/PANI composite prepared by chemical oxidation and micromulsion methods has special morphologic pictures and themostabilization. But its specific capacitance does not improve too much. It was found that BC/PANI prepared by dynamic interfacial polymerization with the shape of spherical,short stick and fiber and themostabilization characterized by SEM and TG-DSC. Spherical PANI's diameter is around 0.5 um, The other two has diameter of 100 nm. More important electrochemical performance of the composite is much better than pure BC and PANI. It is proved that, when C(HCL)=1 moL/L, n(NH4)2S2O8:n(An)=1, BC content is 60%, system volume is 500 mL, BC/PANI composite prepared by dynamic interfacial polymerization first discharge capacitance as high as 280 F/g, is 2.5 times as pure BC(107 F/g) and 7.4 times as pure PANI(38 F/g). After 100 charge-discharge cycles at the current density of 0.1 A/g the specific capacitance is 180 F/g, is 1.94 times as pure BC(93 F/g) and 25.7 times as pure PANI(7 F/g), and PANI has short stick morphologic picture under this condition.