交联型聚(联苯-哌啶)阴离子交换膜制备与电解槽性能研究

Study on preparation of cross-linked poly(biphenyl-piperidine) anion exchange membrane and electrolyzer performance

为制备出同时具备高电导率和高稳定性的阴离子交换膜(AEM),以1,6-二溴己烷为交联剂,采用浇铸法制备了不同交联度的交联型聚(联苯-哌啶)AEM(PBP-Pip-x%膜,x代表交联度,取值分别为5、10和15)。分别采用^(1)H NMR和AFM对PBP-Pip-x%膜的结构和形貌等进行了表征,并以未交联的聚(联苯-哌啶)AEM(PBP-Pip膜)作为对照组,研究了PBP-Pip-x%膜的性能。结果表明,PBP-Pip-15%膜具有更好的微相分离结构,其电导率(99.14 mS/cm)较PBP-Pip膜的电导率(49.89 mS/cm)明显提高。PBP-Pip-15%膜表现出较好的碱稳定性,在1 mol/L KOH溶液中于80℃浸泡300 h后,其电导率为37.50 mS/cm,电导率保留率为79.73%。在设定条件(温度为80℃、1 mol/L KOH溶液中和小室电压为2.0 V)下,PBP-Pip-15%膜的电流密度为0.5 A/cm^(2),并且在100 h内稳定性未发生明显改变。

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/cm^(2),and the stability of PBP-Pip-15% membrane does not change significantly within 100 h.