The Preparation Of Nitrogen-doped Activated Carbon And Its Research Of Supercapacitors Performance

Because of the growing shortage of energy, supercapacitor is akind of new energy storage and get more attention, supercapacitor has more usefulthan traditional chemical battery. In the research of the supercapacitor, it is of greatpractical value and theoretical significance to develop electrode materials with highspecific capacity. It is generally to improve the surface area and pore structure orintroduce non-carbon of the carbon materials that can improve the electrochemicalperformance. It is easy and effective to dope nitrogen, so it has much more attentionin recent years. In this paper, the nitrogen doped precursor is aniline. Nitrogen dopedactivated carbon is produced by treatment with carbonization after in-situpolymerization. And the electrochemical performance has been studied as electrodematerials of supercapacitor. The main studies of this paper as follows:Aniline is coated on Activated Carbon (AC) by in-situ polymerization, and thenpolyaniline/activated carbon (PANI-AC) is obtained. Then, PANI-AC is carbonizedat700℃and900℃to get N-Doped activated carbon. Scanning electronmicroscopy (SEM), X-ray photoelectron spectroscopy (XPS), specific surface areaanalyzer are used to characterize the surface morphology and composition of material.It shows that the surface of material is doped with nitrogen after carbonization,without destroying the intrinsic of AC. The N-Doped activated carbon has highspecific surface area by the surface analysis. Cyclic voltammetric (CV) measurementsand electrochemical impedance spectrum (EIS) are used to discuss theelectrochemical performance of the N-AC. Experimental results show that when theweight ratio of aniline to activated carbon is equal to6:4and carbonization at700℃,the N-AC which has higher specific capacity whose value can reach182F·g1. Thecomposite material whose internal resistance is1, and it has good electricalconductivity. Improving hydrophility and making the electrode material and theelectrolyte contacted conveniently contributed by nitrogen doped, so it also haspromoted the electrochemical performance. The test of cycle life show thatelectrochemical performance of the material is stable, and it has a good cycleability.Therefore, the research of this paper provides theoretical and experimental basis forfinding nitrogen-doped activated carbon material with better performance.