Polyaniline Composites Preparation And Energy Stoeage Applications

In recent years, supercapacitors as the electrical energy storage systems have attracted growing attention due to quick charge and discharge rate, high efficiency, environmental pollution, long cycle life. The electrode material is the key to determine their electrochemical performances. Polyaniline(PANI) is one of the most intensively investigated conductive polymers due to its environmental stability, special electrical property, low raw material and ease of synthesis, however, because of the disadvantages of the pure polyaniline, such as the low specific capacitance, poor circle stability and so on, its universal application has been limited. Carbon nanotubes (CNTs) as a good filling material with its unique electrical, mechanical properties have been one of the most attractive areas of research. Preparing CNTs and PANI to be composite material could conquer the disadvantages of each other, and increase the specific capacitance.Firstly, the aniline was inarched on the surface of the carbon nanotubes by a series of organic reaction. Then, the aniline on the surface of the CNTs was polymerized to PANI by the in situ chemical polymerization, organic chemistry inarching-electrochemistry deposition polymerization and organic chemistry method synthesis. At last, a nanometer composite named as the CNTs/PANI composite were obtained. Constitution and morphology of the obtained CNTs/PANI composite were characterized by Fourier transform infrared spectroscope and scanning electron microscope. And the electrochemical performances of the obtained materials were tested by the cyclic voltammograms, galvanostatic charging/discharging, cycles life, and electrochemical impedance spectroscopy. Specific studies are as follows:1,Through organic synthesis, the aniline was grafted on the surface of the carbon nanotubes by series of organic chemistry reactions. Then, the aniline grafted on the CNTs was polymerized to polyaniline by in-situ chemical polymerization. Because of the precise control combination of CNTs and PANI and giving full play to their strengths, it create synergies between them. At last, the methods improve the electrochemical properties. Electrochemical specific capacity can reach 152F/g (organic electrolyte). At the same time,we discuseed that carboxyl different locations of composites have also impact on electrochemical performances of composites.2,Preparation of carbon nanotubes/polyaniline nano-composites by organic chemistry inarching-electrochemistry deposition polymerization.Firstly carbon nanotubes-aniline materials were prepared by the reaction of functionalized carbon nanotubes and aniline. Then, the CNTs with the aniline and the other aniline were polymerized in the sulfuric acid solution on the surface of stainless steel by electrochemistry cyclic voltammetry deposition method at the different scanning rate. The experimental results showed that the scanning rate was 20mV/s, the obtained composite had the best conductivity and electrochemical capacitance. The single-electrode special capacitance was up to 397F/g with the 22A/m2 charging-discharging current density.3,In this paper, the Fe3O4 was used as a template to prepare carbon nanotube (CNT)/polyaniline (PANI) composite. Firstly, the aniline was grafted on the surface of the CNT by series of organic chemistry reactions. The CNT was absorbed on the surface of the Fe3O4 oxide. Then, the aniline grafted on the CNT was polymerized to PANI by in-situ chemical polymerization. At last, a hollow sphere structure composite was obtained. And the obtained CNTs/PANI composite had high specific capacitance of 185F/g (organic electrolyte) at the current density of 3.4A/m2.