Preparation and characterization of organic-inorganic hybrid anion exchange membrane based on crown ether functionalized mesoporous SBA-NH2

In this paper, self-made diformyl-dibenzo-18-crown-6 ether (DDB18C6) is in-situ grafted into the pores of mesoporous molecular sieve (SBA-NH2), and then the aforementioned modified molecular sieve (SBA-C) is introduced into the polyvinyl alcohol solution, and then the glutaraldehyde as the crosslinking agent to synthesized the anion exchange membrane under for fuel cell application. During the experiment, a series of anion exchange membranes (P-(SBA(x%)-C), x is the mass fraction of SBA-NH2) is developed and the pore channels and chemical structures of the aforementioned membrane is verified by FT-IR, SAXD, N-2 adsorption-desorption, H-1 NMR and XPS. Moreover, the performance of the membrane synthesized in this paper is also investigated and the results revealed that the unique membrane internal structure can improve the OH- transportation efficiency. Furthermore, the ionic conductivity of P-(SBA(10%)-C) membrane is the highest (0.107S.cm(-1)) and the power density is the highest (354.8 mW cm(-2)) at 80 ?. By immersing P-(SBA(10%)-C) membrane in 6 mol L-1 KOH solution for 168 h, the conductivity at 80 ?& nbsp;only decreased by 2%, proving that P-(SBA(10%)-C) has a higher conductivity, good single cell performance and alkali stability. (C)& nbsp;2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In this study, a self-made diformyl-dibenzo-18-crown-6 ether (DDB18C6) was grafted into mesoporous molecular sieve (SBA-NH2) to synthesize a modified molecular sieve (SBA-C), which was then used to fabricate an anion exchange membrane for fuel cell applications. The synthesized membrane demonstrated improved OH- transportation efficiency due to its unique internal structure. The P-(SBA(10%)-C) membrane exhibited the highest ionic conductivity (0.107 S.cm(-1)) and power density (354.8 mW cm(-2)) at 80 ?. Additionally, the P-(SBA(10%)-C) membrane showed only a 2% decrease in conductivity after immersion in 6 mol L-1 KOH solution for 168 h, indicating its higher conductivity, good single cell performance, and alkali stability.