The preparation and rate charge/discharge performance of PANI/GO connected by ionic and hydrogen bonds

In order to improve the rate charge/discharge performance and cyclic performance of graphite oxide （GO）, PANI/GO composites with excellent charge/discharge performance were prepared by grafting polyaniline （PANI） on GO through ionic and hydrogen bonds. The physical characteristics of PANI/GO were analyzed by X-ray diffraction, infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersion spectrum and N₂ adsorption/desorption techniques. Besides, the charging/discharge performance of PANI/GO in KOH electrolyte was evaluated using a symmetrical capacitor. The results show that GO has a hexagonal phase crystalline structure. After the modification, GO is coated with PANI particles and the content of N atoms is increased by 5 times. In PANI/GO, PANI and GO are connected by ionic and hydrogen bonds and N exists in the framework as ─ \textNH_2^+ ─, ─NH─ and ═N─ species. In KOH solution, the electrochemical feature of PANI/GO is dominated by both electrical double-layer capacitance （EDLC） and pseudocapacitance. At 0.2 A·g⁻¹, the specific discharge capacity of PANI/GO is 99.1 F·g⁻¹, which is 2.1 times that of GO. When the current density is enhanced to 10 A·g⁻¹, the capacitance retention rate is 1.15 times that of GO. After 5 000 cycles, the capacity retention of PANI/GO is 4.9% higher than that of GO. The research results could provide reference for the improvement of rate charge/discharge properties and cyclic feature of low conductivity porous materials.