Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 620, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2020.118919
Keywords
Polybiphenyl piperidine; Spiro cation; Side chain functionalization; Anion exchange membrane; Alkali stability
Categories
Funding
- National Key Research and Development Program of China [2019YFA0210300]
- National Natural Science Foundation of China [21776014, 51961145107]
- Fundamental Research Funds for the Central Universities [12060093063]
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Research on ion conductivity and mechanical stability of anion exchange membranes has made great progress, but the focus is now on preparing AEMs with high alkali stability. By introducing the alkali-stable cation BOP-ASU into AEMs, high ion conductivity and excellent alkali stability were achieved, showing potential for application in anion exchange membrane fuel cells.
Research on the ion conductivity and mechanical stability of anion exchange membranes (AEMs) has achieved great progress, it is more urgent to prepare AEMs with high alkali stability. Azaspimcyclic cations are among the most alkali-stable cations. In this study, a synthesized long-chain 3-(3-(1-(8-bromooctyl) piperidin-4-yl) propyl)-6-azaspiro [5.5] undecan-6-ium bromide(BOP-ASU) cation was introduced into a portion of a piperidine ring on a PBP backbone to prepare PBP-BOP-ASU, and AEMs based on PBP-ASU and PBP-BOP-ASU were prepared. The structure of each product was characterized (1H NMR, MS), and the prepared anion exchange membrane was also characterized using micromorphology (SEM, TEM, AFM) and performance tests (TGA, WU, SR, ion conductivity, alkali stability). The PBP-BOP-ASU (8% membrane) showed the highest ion conductivity (117.43 mS/cm) at 80 degrees C. In addition, it showed excellent alkali stability in a test environment of 2 M NaOH solution at 80 degrees C for 1400 h. Moreover, the introduction of side chain spiro cations could improve the microscopic phase separation structure of the AEMs, and it also increased their ionic conductivity, thus ensuring the potential for their application in anion exchange membrane fuel cells.
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