Study On The Performance Of Polyanline Nanofibers And Its Carbonization Products

The supercapacitor is an energy storage system between traditional capacitors and batteries.In recent years, the supercapacitor has been widespread concern in society as a new electrode material. The polyaniline(PANI) is the synthetic process of green environmental protection, required for the preparation of wide raw material sources,simple synthesis process, the preparation of low cost, high stability, good electrochemical capacitance characteristics. So it is considered to be a supercapacitor electrode material with great potential for development.The one-dimensional nano materials, with high specific surface area, larger ratio of length to diameter, provides the possibility of polyaniline and give full play to its advantages. So the research of polyaniline nanofibers in the electrode material also has important value.Based on the multi access documents, we preparation of good morphology of the polyaniline fiber.The PANI/AC composite was synthesized by the method of in-situ growth. The carbonization temperature of polyaniline was optimized, and the PANI/AC composite material was carbonization by optimal carbonization temperature.The polyaniline fiber, PANI/AC composite materials, carbonization of polyanilinecarbon fiber materials on this paper were characterized by scanning electron microscopy, thermogravimetric analysis, infrared analysis, XRD. The electrochemical performance of Polyaniline and its carbonization products were tested by electrochemical workstation. The cyclic life of the materials was investigated by cyclic voltammetry.In this paper, through optimizing the process of the preparation of polyaniline fiber, We achieved the controllable preparation of polyaniline fiber. This paper synthesized polyaniline nanofibers with good morphology, its diameter is about50~100nm, the length is about 1~2 μm.The paper also investigated the electrochemical performance of polyaniline fibers, the specific capacitance of polyaniline nanofibers capacity is 427.2F/g, have been close to the theoretical capacity of Polyaniline.Based on the synthesis of polyaniline fibers were prepared via in-situ polymerization of PANI/AC composites, as PANI/AC-20, PANI/AC-50, PANI/AC-100 and specific capacitance of the composite material are respectively236.7F/ g, 201.3F/g,155.6F/ g.After 20 voltammetric cycles the capacity loss rates were5.8%, 5.5%, 4.8%. This indicates that the composite has a high specific capacitance and high cycle life. Based on polyaniline carbonization process optimization, we obtained that under the temperature of 700℃ polyaniline has maintained a high specific capacitance of 103.53F/g. By carbonization of PANI/AC composites in this temperature,PANI/AC-20, PANI/AC-50, PANI/AC-100 composite material by carbonization of the specific capacity was 70.6F/g, 93.5F/g, 154F/ g. The specific capacitance after20 voltammetric cycles decay rates were 0.42%, 2.67%, 0.58%. It shows that the carbonization improve the cycle life of PANI/AC composite, PANI/AC composite and synthesized in high dosage of AC can increase the specific capacitance of activated carbon.