膜
杂原子
离子交换
化学
高分子化学
聚合物
碱金属
核化学
材料科学
有机化学
离子
生物化学
戒指(化学)
作者
Meizi He,Yingda Huang,Rui Wang,Zixin Lv,Huibin Xu,Xin Wang,Min Liu,Bin Hu,Qinghai Chen,Hongjing Li,Jifu Zheng,Nanwen Li
标识
DOI:10.1016/j.memsci.2023.122109
摘要
Alkaline stability is the main obstacle for anion exchange membranes (AEMs) for alkaline electrolysers. In order to research the effect of N-heteroatom polymers on the alkaline stability of N-dimethylpiperidinium (DMP) based AEMs, in this work, nine kinds of blend membranes were prepared by blending poly (oxindole biphenylene) (POBP), poly (N-methylisatin biphenylene) (mPOBP) and poly (biphenyl 4-imidazolecarboxaldehyde) (PB4Im) with poly (aryl piperidine) polymers (PTP-85) at the ratio of 1:19, 1:9, and 1:4, respectively. Moreover, in the preliminary investigation of alkaline stability, we broke the limitation of the immiscibility of the blend membranes and performed a comparative investigation by the 1H NMR. Surprisingly, the obtained blend membranes showed a much higher degree of degradation than PTP-85 in terms of ex-situ alkaline stability. The alkali absorption of different N-heteroatom polymers in different concentrations of NaOH at 55 °C and 80 °C showed that the alkaline stability of blend membranes was lower with the increase of alkali absorption. The in-situ stability test also demonstrated that the performance of blend AEMs decreased significantly after in-situ durability test under the galvanostatic mode. These results showed that blending with N-heteroatom polymers could negatively affect the alkaline stability of DMP-based AEMs, providing insight into the relationship between N-heteroatom and stability of DMP-based AEMs.
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