Synthesis And Properties Study Of Anion Exchange Membrane For Fuel Cell

In order to improve the anion-exchange membrane ion conductivity, an anion exchange membrane was prepared which the norbornene anhydride as a raw material monomer, two functional groups were introduced on the monomer for increasing the ion exchange capacity per unit volume. Materials Studio (MS)software was used to calculate energy barrier, analyze the feasibility of forming a judgment diquaternary monomers or not. Simulation and experimental results show that the molecular structure design and the experimental method is feasible.A series of crosslinked anion exchange membranes are prepared through ROMP of tetraalkylammonium- functionalized norbornene derivates.Dimensional stability and mechanical properties were enhanced by crosslinker.Thermal stability, Ion exchange capacity (IEC ) , water uptake, swelling ratio,ion conductivity and mechanic property of the membranes have been investigated. the resultant membrane (AEM-F) had an ion conductivity of 64.79 mS·cm-1, a water absorption of 12.5% and a tensile strength of 15.18 MPa at 25 ℃. The swelling ratio of AEM-B was 9.28 % at 20 ℃ and 9.92 % at 60 ℃.Mechanical strength of membranes was improved by crosslinker. H2/O2 single fuel cells with AEM-F membrane showed 151.36 mW·cm-2 maximum power density at 50 ℃. The crosslinked membranes have great potential for anion exchange membrane fuel cells due to the higher ion conductivity and better dimensional stability.A series of amorphous cells were constructed and optimized. Then,molecular dynamic (MD) simulations were used for investigating the relationship between hydroxide ion and microstructure of a polymer based on polynorbornene for fuel cell and transportation mechanism of hydroxide ion.The simulated diffusivity of hydroxide ions in cells exhibited the same trend as the experimental data by comparing diffusion coefficients of simulation and ion conductivities of experiment.