Preparation Of Polymer Nanocomposites And Carbon Materials Based On Imidazole Ionic Liquid

Ionic liquids are attracting much attention and in-depth study due to their negligible vapor pressure, good thermal stability, wide electrochemical window, high electrical conductivity and good chemical stability, good ion exchange capacity and other physical and chemical properties. Noble metals gold, platinum and silver have a very strong catalytic activity, and their nanoparticles are widely used in a variety of catalytic reactions. However, the metal nanoparticles are easily aggregated, affectting the catalyst efficiency..In this paper, the novel nanocomposites based on ionic liquids are synthesised.The fuel cell has gained great attention study due to their high energy conversion efficiency, no pollution, continuous high-power discharge. And as a clean, new energy efficient system of sustainable development fuel cell has become one of the effective ways to solve the global energy crisis and environmental pollution. However, the noble metal Pt catalyst used on anode and cathode are reserves less and expensive, resulting in high cost of the fuel cell and limitting the large-scale commercial applications. In this paper, the novel non-precious metal catalyst Fe-N co-doped carbon materials based on ionic liquid are synthesised.The main contents and conclusions are summarized as follows:(1)A facile and effective procedure for the preparation of poly(divinybenzene-co-chloromethylstyrene)(poly(DVB-co-VBC)) nanotube/Au-Ag nanoparticle composite(NT-Im-Au-Ag) via using covalently attached imidazolium as linkers was reported. The approach involves the surface functionalization of poly(DVB-co-VBC) NTs with imidazolium cation, anion-exchange with Au precursor(HAu Cl4) and followed by the reduction of metal ions. The obtained NT-Im-Au nanoparticle composite was further used as the seeds to produce NT-Im-Au-Ag nanoparticle composite. The nanocomposites were characterized by by SEM, Raman spectroscopy and so on. The as-prepared NT-Im-Au-Ag nanohybrids show an extremely suitable substrate for surface-enhanced Raman spectroscopy(SERS) with a high enhancement factor of 6.7×107, enabling the detection of 10-12 M Rhodamine 6G solution. The catalytic performance of NT-Im-Au-Ag nanohybrids was studied by the reduction of 4-nitrophenol with Na BH4 as a reducing agent. Their reaction rate constant was calculated according to the pseudo-?rst-order reaction equation.(2)This paper also designed a new method for preparing nitrogen-doped and iron-doped carbon materials. Bis-doped porous carbon materials are prepared via carbonization of a room temperature ionic liquid [Si-pim] [Fe Cl4], using mesoporous silica template(SBA-15) and are applied to the oxygen reduction reaction(ORR). This paper studied the influence of the content of Fe in the catalytic ORR performance. The porous structure increases the contact area between the catalyst surface and oxygen in the oxygen reduction reaction. And the porous structure also increase the amount of the exposed N and Fe-N,which are active sites for ORR。...