The effect of TBHQ antioxidant on the durability of perfluorosulfonic acid proton exchange membranes
The effect of Tert-butyl hydroquinone(TBHQ),a low-cost industrial antioxidant,on the durability of perfluorosulfonic acid(PFSA)proton exchange membrane was systematically studied.This antioxidant has low mobility and it will not combine with sulfonic acid group to cause the loss of proton conductivity.Because of that,it is expected to provide excellent durability while maintaining membrane performance.Firstly,the PFSA/TBHQ composite membrane was prepared by tape casting method.The optimal addition of TBHQ was 1％and the optimal heat treatment temperature of the membrane was 140 ℃.The structure and properties of the membrane were studied by scanning electron microscope,universal tensile testing machine,thermogravimetric analyzer,electrochemical workstation and fuel cell tester.Fenton accelerated oxidation test results show that the proton conductivity of the composite membrane was 45.1％higher than that of the pure membrane after 24 hours of degradation;The membrane electrode was prepared and its durability was tested by open circuit voltage holding method.The results showed that after 96 hours of open circuit operation,the maximum power density of the composite membrane was 28.48％higher than that of the pure membrane,and the life of the composite membrane electrode was significantly improved.
proton exchange membraneperfluorosulfonic acidtert butyl hydroquinonehigh temperature heat treatmentdurability
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