Preparation And Study Of Polyphenylene Ether DABCO Anion Exchange Membrane For Fuel Cell

As we all know,an important reliance on the progress of human society is the development of energy types.The evolution of energy which the mankind depends on has gone through the wage-age in the feudal society to the coal age after the industrial revolution,the oil age after the second industrial revolution and the electrical age of modern society.In these few thousand years of development,more efficient energy has always promoted the continuous improvement of social economy.In the current world,the main source of energy is fossil fuels born from ancient Earth mothers.With the progress of human science and technology,we have not only concerned about the energy efficiency,but also attach more importance to the sustainability and cleanliness of energy and do not lead the way of pollution.Therefore,human scientists assert that in the future world,the prospect of energy development is to replace the traditional fossil fuels and fossil energy with new,clean and sustainable energy.New energy will play an increasingly crucial role in providing energy to the world,in shaping the shaping of energy structure in the future world,and in its socio-economic share.Since the second industrial revolution,the utilization and division of energy.The tripartite confrontation of fossil fuels has also led to the rapid economic development of mankind.However,the increasing awareness of environmental protection in the new era has made the use of fossil fuels a hindrance to the development of the times.Therefore,the trend of rapid development of clean energy such as hydrogen energy and nuclear energy has been imperative in modern times.Hydrogen,as the new generation of clean energy with the highest international voice,is getting more and more social attention.Hydrogen fuel cells have the advantages of small size,high energy density of hydrogen combustion,high utilization efficiency of hydrogen energy and no secondary pollution.All of these have made them the most perfect hydrogen energy conversion devices.In the current large family of fuel cells,polymer membrane fuel cells at the core of polymeric membranes have become the focus of research.Alkaline membrane fuel cells are devices that convert hydrogen directly into electrical energy under alkaline conditions,which have the advantages of higher energy conversion efficiency,reaction kinetic constants,and cheaper catalysts than proton membrane fuel cells,The most important core component of the device is the anion exchange membrane(AEM)which is what we usually refer to as the basic membrane.Therefore,an important way to improve the performance of the current alkaline membrane fuel cell is to study and prepare the alkaline membrane which is required for the current industrial recombination.This is a crucial step toward the development of alkaline membrane fuel cells and the development of hydrogen energy utilization.At present,scientists in all countries focus on the basic membrane research mainly lies in:grafting the quaternary ammonium,quaternary phosphonium,imidazole and other anionic conduction groups to a the polymer backbone which have good physicochemical properties in basic working environment by chemical and physical methods,and then through a series of modification means,making the membrane performance enhancement,casting membrane.Alkaline membranes suitable for current industrial and domestic' applications are prepared.Such synthesis method is undoubtedly efficient and low cost,but the main problem with this traditional method is that AEM has poor mechanical and chemical properties.This paper mainly aims at the problems of poor alkali stability and low ionic conductivity,and proposes some improvements:1.Preparation and Study of Polyphenylene Ether DABCO Anion Exchange MembraneThe cross-linking agent was prepared by the reaction of 1,4-diazabicyclo[2.2.2]octane(DABCO)and 1,4-dichlorobenzyl.This crosslinking agent was introduced into the conventional polyphenylene ether-trimethylamine(BPPO-TMA)membrane to reduce the mechanical degradation of the membrane.Crosslinkers function to immobilize the polymer structure within the membrane and assist in the conduction of hydroxide ions.By comparing the basic membrane after the introduction of crosslinking agent,we can see the mechanical properties,alkali stability and ionic conductivity of the membrane have been significantly improved.2.Preparation of Polyphenylene Ether DABCO Nano-TiO2-Ionic Liquid Composite MembraneSince the ionic conductivity of polyphenylene ether-based DABCO anion exchange membrane is still low,the prepared free imidazolium ionic liquid is introduced into the solution of the crosslinked membrane,by stirring to dissolve and disperse to form an "active site".The electrostatic attraction between the imidazole ionic liquid monomer positive charge center and.hydroxyl ions increases membrane conductivity.After the introduction of ionic liquid,it filled the blank of the adjacent trimethylamine conduction group in the membrane,which increased the conduction sites in the membrane and thus the hydroxyl ions could pass more smoothly and have faster conduction speed in the alkaline membrane,to chieve "leap-type" conduction,and a fundamental increase in ion conductivity.In the test,it was found that the mechanical properties and ion conductivity of the membrane are greatly reduced at high temperature and high humidity.This is because under high temperature and high humidity environment,due to the collapse of the polymer skeleton and the good water solubility of ionic liquids,ionic liquid will occur a lot of loss.Therefore,the nano-titania particles containing a positive charge center are introduced into the membrane.Immobilization of ionic liquids at high temperature through the adsorption of particles and ionic liquids,reducing ionic liquid loss.The stabilizing effect of nano-titania on ionic liquids makes the higher concentration of free ionic liquids can be stably retained in AEM,so.that more ionic liquids can play a role in assisting hydroxide ion conduction.Incorporation of nano-titanium dioxide,the composite membrane ion conductivity has been significantly improved.3 Preparation of Polyphenylene Ether DABCO Nano-ZrO2-Ionic Liquid Composite MembraneBased on the above experiments,we choose zirconium dioxide particles with larger ionic radius to enhance the self-assembly between nanosized zirconia and free ionic liquids to the immobilization efficiency of ionic liquids.The effect of doped particles on the performance of the membrane was investigated.According to the comprehensive performance of all.aspects,the thermal stability of the membrane after the incorporation of nanometer zirconium dioxide is better,and the ion conductivity is slightly higher than that of the anion exchange film doped with titanium dioxide.