Study on preparation of cross-linked poly(biphenyl-piperidine)anion exchange membrane and electrolyzer performance
In order to prepare anion exchange membrane(AEM)with high conductivity and high stability,1,6-dibromohexane was used as crosslinking agent,and cross-linked poly(biphenyl-piperidine)AEM(PBP-Pip-x％membrane,x represents crosslinking degree and the values of x are 5,10 and 15,respectively)with different crosslinking degrees were prepared by casting method.The structures and morphologies of PBP-Pip-x％membranes were characterized by 1H NMR and AFM,respectively,and the properties of PBP-Pip-x％membranes were studied by using uncross-linked poly(biphenyl-piperidine)AEM(PBP-Pip membrane)as the control group.The results show that PBP-Pip-15％membrane has better microphase separation structure,and its conductivity(99.14 mS/cm)is significantly higher than that of the PBP-Pip membrane(49.89 mS/cm).PBP-Pip-15％membrane shows good alkali stability,and after soaking in 1 mol/L KOH solution at 80 ℃ for 300 h,the conductivity of PBP-Pip-15％membrane is 37.50 mS/cm and the conductivity retention rate is 79.73％.Under the set up conditions(temperature of 80 ℃,1 mol/L KOH solution and cell voltage of 2.0 V),the current density of PBP-Pip-15％membrane is 0.5 A/cm2,and the stability of PBP-Pip-15％membrane does not change significantly within 100 h.
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