High chemical stability anion exchange membrane based on poly(aryl piperidinium): Effect of monomer configuration on membrane properties. (20th May 2021)

• Record Type: Journal Article
• Authors: Long, Chuan; Wang, Zhihua; Zhu, Hong
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 35(2021)
• Page Start: 18524
• Page End: 18533
• Publication Date: 2021-05-20
• Subjects: Anion exchange membrane -- Poly(aryl piperidinium) -- Hydroxide conductivity -- Chemical stability -- Fuel cells; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.02.209
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In recent years, ether-free polyaryl polymers prepared by superacid-catalyzed Friedel-Crafts polymerization have attracted great research interest in the development of anion exchange membranes(AEMs) due to their high alkali resistance and simple synthesis methods. However, the selection of monomers for high-performance polymer backbone and the relationship between polymer structure construction and properties need further investigated. Herein, a series of free-ether poly(aryl piperidinium) (PAP) with different polymer backbone steric construction were synthesized as stable anion exchange membranes. Meta-terphenyl, p-terphenyl and diphenyl-terphenyl copolymer were chosen as monomers to regulate the spatial arrangement of the polymer backbone, which tethered with stable piperidinium cation to improve the chemical stability. In addition, a multi-cation crosslinking strategy has been applied to improve ion conductivity and mechanical stability of AEMs, and further compared with the performance of uncrosslinked AEMs. The properties of the resulting AEMs were investigated and correlated with their polymer structure. In particular, m-terphenyl based AEMs exhibited better dimensional stability and the highest hydroxide conductivity of 144.2 mS/cm at 80 °C than other membranes, which can be attributed to their advantages of polymer backbone arrangement. Furthermore, the hydroxide conductivity of the prepared AEMs remains 80%–90% after treated by 2 M NaOH for 1600 h, exhibiting excellent alkaline stability. The single cell test of m-PTP-20Q4 exhibits a maximum power density of 239 mW/cm 2 at 80 °C. Hence, the results may guide the selection of polymer monomers to improve performance and alkaline durability for anion exchange membranes. Graphical abstract: Image 1 Highlights: A series of poly(triphenyl piperidine) with different monomers were prepared. The relationship between structure construction and properties was investigated. The membrane showed controllable mechanical stability and excellent alkaline stability. The membrane showed a maximum hydroxide conductivity of 144.2 mS/cm at 80 °C.