4.7 Article

Insight into alkaline stability of N-heteroatom on N-dimethylpiperidinium based anion exchange membranes (AEMs) for alkaline water electrolysis

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JOURNAL OF MEMBRANE SCIENCE
卷 688, 期 -, 页码 -

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DOI: 10.1016/j.memsci.2023.122109

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Alkaline stability is the main obstacle for anion exchange membranes (AEMs) in alkaline electrolyzers. This research investigated the impact of N-heteroatom polymers on the alkaline stability of N-dimethylpiperidinium (DMP) based AEMs. The study found that blending with N-heteroatom polymers negatively affected the alkaline stability of DMP-based AEMs, providing new insights into the relationship between N-heteroatom and stability of DMP-based AEMs.
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 H-1 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 degrees C and 80 degrees 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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