Alkali-stable partially fluorinated poly(arylene ether) anion exchange membranes with a claw-type head for fuel cells

作者：Wang, Xiu Qin; Lin, Chen Xiao; Liu, Fang Hua; Li, Ling; Yang, Qian; Zhang, Qiu Gen; Zhu, Ai Mei; Liu, Qing Lin^*

来源：Journal of Materials Chemistry A, 2018, 6(26): 12455-12465.

DOI：10.1039/c8ta03437k

• MULTIBLOCK COPOLYMER MEMBRANES
• POLYMER ELECTROLYTE MEMBRANE
• QUATERNARY AMMONIUM CATIONS
• SIDE-CHAIN
• HYDROXIDE CONDUCTIVITY
• POLY(PHENYLENE OXIDE)
• IMIDAZOLIUM GROUPS
• STABILITY
• SULFONE)
• PERFORMANCE

To enhance the conductivity and alkaline stability of anion exchange membranes (AEMs), partially fluorinated poly(arylene ether) AEMs with functionalized claw-type side chains are prepared. It is found that the integration of a claw-type head into the side chain and a fluorinated moiety into the backbone is favorable for forming a well-defined hydrophilic/hydrophobic phase-separated structure, as confirmed by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). A highest hydroxide conductivity of 98.19 mS cm(-1) is achieved for FPAE-3B-3.0-PD with an ion exchange capacity (IEC) of 1.16 meq. g(-1). Besides, the as-prepared AEMs exhibit good dimensional stability, robust mechanical properties and high thermal stability. The FPAE-3B-3.0-PD membrane still maintains about 94% and 93% of its initial IEC and conductivity after being immersed in a 1 M aqueous KOH solution at 80 degrees C for 600 h. The change in the chemical structure of the AEM before and after the alkaline stability test is negligible, as noted by H-1 NMR. Furthermore, the single cell using FPAE-3B-3.0-PD has a highest power density of 156 mW cm(-2) at a current density of 350 mA cm(-2) at 80 degrees C.

• 出版日期2018-7-14
• 单位厦门大学