TBHQ抗氧剂对全氟磺酸质子交换膜的耐久性影响

The effect of TBHQ antioxidant on the durability of perfluorosulfonic acid proton exchange membranes

系统研究了一种低成本工业抗氧剂-特丁基对苯二酚(TBHQ)对全氟磺酸(PFSA)质子交换膜耐久性的影响,由于这种抗氧剂不会结合磺酸基造成质子传导能力损失,且迁移率低,因此有望在维持膜性能的同时提供优异的耐久性.首先通过流延法制备了PFSA/TBHQ复合膜,确定TBHQ最佳添加量为质量分数1%,膜的最适热处理温度为140℃,利用扫描电子显微镜、万能拉力试验机、热重分析仪、电化学工作站和燃料电池测试仪等多种仪器研究了膜的结构与性能.Fenton加速氧化性测试结果表明,降解24 h后复合膜的质子传导率比纯膜高45.1%;将膜制备成膜电极并利用开路电压保持法测试了膜电极的耐久性,结果表明,经过48 h的开路运行之后,复合膜的最大功率密度比纯膜高28.48%,同时膜电极寿命也显著提升.

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.