Study On Preparation And Ionic Conductivity Of Metal Organic Frame Composite Membrane Materials

Fuel cell fuel cell is an electrochemical device that converts the energy of fuel directly into electrical energy.It provides an efficient and clean energy conversion mechanism.In addition,fuel cells are compatible with renewable energy sources and modern energy carriers,such as hydrogen,to promote sustainable development and energy security.Polymer electrolyte membranes?also known as proton exchange membranes?fuel cells,one of the most promising types,are already in the early stages of commercialization.Nevertheless,in order to reduce costs,development and research are needed to improve its durability and further optimize and improve other performance.In this paper,polymer electrolyte membrane with chemical stability and low cost is prepared by combining MOFs with polymer,as follows:?1?Hydrothermal method was used to synthesize MOF-801 material with good chemical stability,and"layer-by-layer"method was used to graft ZrP on its framework.The synthesized MOF-801 and MOF-801/ZrP composites were characterized by XRD,SEM and TGA,which proved that they had high phase purity and thermal stability.Furthermore,the composite casting membrane with PVA/PAMPS blend was tested for the proton conductivity of the powder and composite membrane.It was found that the powder had better conductivity at high humidity,and the composite membrane had higher proton conductivity at low humidity.?2?Solvothermal method was used to obtain the MOF-1 with acid stability,which was soaked twice by H₃PO₄,phytic acid and ATMP respectively.According to the XRD test results,the crystal structure of MOF-1 remained intact after acid immersion.The proton conductivity of the composite was tested,it was found that the conductivity of MOF-1 increased after H₃PO₄ immersion.Next,MOF-1 and H₃PO₄@MOF-1 were combined with chitosan to form composite membranes.The proton conductivity of the composite membrane was tested,and it was found that the conductivity of the composite membrane was improved by an order of magnitude compared with the powder.The composite membranes were tested by TGA,and it was found that the composite membranes had good thermal stability.?3?BMIM-ILs/ZIF-8 composites were synthesized by"bottle around ship"method and tested by XRD,FTIR and nitrogen adsorption.It was proved that the composites had high phase purity.BMIM-ILs were not attached to the surface of the frame but in the cavity of ZIF-8.According to the ionic conductivity test,the conductivity of ZIF-8could be improved by loading BMIM-OH and BMIM-HCO₃.BMIM-ILs/ZIF-8 and PVP/PVDF were mixed to form composite membranes,and the methanol swelling rate was tested.It was found that the composite membrane material had a lower methanol swelling rate.The ionic conductivity of BMIM-OH/ZIF-8/PVP/PVDF composite membranes was tested.The results show that BMIM-OH/ZIF-8/PVP/PVDF composite membranes have high OH^-conductivity.