Preparation and performance of the PAN/UiO-66-NH2/Nafion composite nanofiber proton exchange membrane
The proton conductivity of the proton exchange membrane in fuel cells sharply decreases under low humidity conditions,and the membrane also excessively swells under high humidity conditions,which becomes one of the limiting factors for the application of fuel cells.The polyacrylonitrile(PAN)nanofibers with the metal-organic framework(MOF)UiO-66-NH2 was combined to balance the relationship between the two and improve the dimensional stability of the membrane.And the effects of hydrolysis time and reaction temperature on the in-situ growth of UiO-66-NH2 on PAN nanofibers were investigated,followed by the preparation of functionalized nanofiber proton exchange membranes with MOF.The results show that the proton conductivity of the composite membrane has a maximum improvement of 175.36%compared to PAN/Nafion;at 60 ℃,the swelling rate of the composite membrane is reduced by 179.10%compared to Nafion,which can effectively improve dimensional stability and mechanical strength,and has good development prospects.
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