High alkaline stability and long-term durability of imidazole functionalized poly(ether ether ketone) by incorporating graphene oxide/metal-organic framework complex. (19th July 2022)

• Record Type: Journal Article
• Authors: Xu, Jingmei; Ju, Mengchi; Chen, Xuan; Meng, Lingxin; Ren, Jiahui; Lei, Jinxuan; Zhao, Pengyun; Wang, Zhe
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 61(2022)
• Page Start: 25755
• Page End: 25768
• Publication Date: 2022-07-19
• Subjects: Poly(ether ether ketone) -- ZIF-8 -- GO/ZIF-8 -- Alkaline stability -- Anion exchange membranes; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.06.005
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The poly(ether ether ketone) (PEEK) was prepared as organic matrix. ZIF-8 and GO/ZIF-8 were used as fillers. A series of novel new anion exchange membranes (AEMs) were fabricated with imidazole functionalized PEEK and GO/ZIF-8. The structure of ZIF-8, GO/ZIF-8 and polymers are verified by 1 H NMR, FT-IR and SEM. This series of hybrid membranes showed good thermal stability, mechanical properties and alkaline stability. The ionic conductivities of hybrid membranes are in the range of 39.38 mS cm −1 –43.64 mS cm −1 at 30 °C, 100% RH and 59.21 mS cm −1 –86.87 mS cm −1 at 80 °C, 100% RH, respectively. Im-PEEK/GO/ZIF-8-1% which means the mass percent of GO/ZIF-8 compound in Im-PEEK polymers is 1%, showed the higher ionic conductivity of 86.87 mS cm −1 at 80 °C and tensile strength (38.21 MPa) than that of pure membrane (59.21 mS cm −1 at 80 °C and 19.47 MPa). After alkaline treatment (in 2 M NaOH solution at 60 °C for 400 h), the ionic conductivity of Im-PEEK/GO/ZIF-8-1% could also maintain 92.01% of the original ionic conductivity. The results show that hybrid membranes possess the ability to coordinate trade-off effect between ionic conductivity and alkaline stability of anion exchange membranes. The excellent performances make this series of hybrid membranes become good candidate for application as AEMs in fuel cells. Graphical abstract: Image 1 Highlights: The hybrid AEMs showed good dimensional stability and excellent alkaline stability. GO were conducive to ion transport and the construction of ion transport channels. The imidazole groups in ZIF-8 could effectively increase content of "bulk water".