Preparation and properties of proton exchange membrane reinforced by metal-organic framework/ionic liquid

To improve the proton conductivity of the sulfonated polyether ether ketone/ionic liquid (SPEEK/IL ) membrane and reduce the loss rate of IL in the membrane, Cd@Co-MOF-74/Phosphate-4phenylimidazole ionic liquid ([IM2 ][H 2 PO 4 ])/SPEEK ternary composite membranes were prepared by the solution casting method. Results show that due to the formation of hydrogen bonds between the imidazole ring in ionic liquids and the -OH or carboxylic acid groups in MOF, imidazole molecules are anchored on the pore walls of MOF. The proton conductivity of the ternary composite membrane at 120 degrees C is the highest, reaching 26.93 mS<middle dot>cm-1, when the mass fraction of the Cd@Co-MOF-74 doping is 1. 5%. The IL loss rate of bimetallic MOF/IL/SPEEK ternary composite membranes with different contents is generally between 20% and 25%. Doping bimetallic MOFs in SPEEK/IL membranes ensures high proton conductivity while reducing the swelling rate of SPEEK/IL composite membranes, thereby increasing their service life.