Controllable Preparation And Electrochemical Properties Of Polyaniline Based Composites

Conductive polymers have drawn much attention in the field of supercapacitors because of their low cost,environmental friendliness,high electrical conductivity and large specific capacitance.However,most polymers are prepared by polymerization under low temperature or electrochemical deposition which means more demanding synthesis conditions and show the poor cyclic property.Therefore,composites composed of polymers preparing through simple methods have become the research hot spots in the field of electrode materials.In this paper,single-phase or multiphase materials-MoS2 with different morphology,lamellar rGO/MoS2 and flower-like Ti02@C were studied respectively,subsequently,we obtained the composites with lamellar/rod-shaped structure or rod-shaped flower structure through compounding with PANI to research the morphology and electrochemical properties of the composites.During these periods,polyaniline were synthesized by in situ polymerization under room temperature with KH(IO3)2 or ammonium persulfate as the oxidant.(1)For polyaniline,the one prepared by KH(IO3)2 was in the shape of a slender rod with the length of 1 um and the diameter of 100 um,while the one prepared by ammonium persulfate was much shorter and thicker although being in the same shape.Both two mentioned methods were performed at room temperature,thus making them more conducive to industrial production.(2)To synthesize composites with lamellar/rod structure,three kinds of MoS2 were prepared by hydrothermal method,which could be described as flower-like,granular and hollow-tube MOS2.With flower-like MOS2 as the matrix material and KH(IO3)2 as the oxidant,MOS2/PANI composites with different contents were prepared.Binary composites(MoS2/PANI(III))with 0.04 g MOS2 showed the highest capacitance.Graphene oxides were added to obtain rGO/MoS2/PANI composites.In this case,all the electrochemical performances of the ternary composites were improved and exhibited the optimal capacitance of 531 F g-1 at 1 A g-1 and remained 86.7%of the original capacitance after 3000 cycles.(3)In order to prepare the composite materials with rod-shaped flower structure,TiO2@C binary composites represented as flower-like microstructure were obtained through hydrothermal method and calcination under the inert atmosphere.Subsequently,TiO2@C/PANI with different contents could be obtained with TiO2@C as the matrix materials and ammonium persulfate as the oxidant.TiO2@C/PANI composites demonstrated a clear performance boost after compounding with highly conductive PANI and showed the highest mass specific capacitance of 558.875 F g-1 at 1 A g-1,which remained 70.35%of the original capacitance after 1000 cycles and still maintained 399.375 F g-1 while increasing the current density to 5 Ag-1.