Di-piperidinium-crosslinked poly(fluorenyl-co-terphenyl piperidinium)s for high-performance alkaline exchange membrane fuel cells?

Journal of Materials Chemistry A Pub Date: 2022-01-17 DOI: 10.1039/D1TA10178A

Abstract

Modern anion exchange membrane (AEM) fuel cells (AEMFCs) call for highly conductive, durable, and mechanically tough AEMs and ionomers. Here, we report a series of scalable di-piperidinium-crosslinked poly(fluorenyl-co-terphenyl piperidinium) (x-PFTP-DP-Cn) copolymers with high ion exchange capacity (IEC) and tunable crosslinking alkyl spacers (Cn, n = 5 or 10) to reinforce the mechanical strength and optimize the electrochemical performance of poly(aryl piperidinium)-based AEMFCs. Specifically, durable x-PFTP-DP AEMs display high ion conductivity (HCO3? >90 mS cm?1 and OH? >180 mS cm?1 at 90 °C) and excellent mechanical strength (tensile strength ～90 MPa, elongation at break ～35%). Importantly, the x-PFTP-DP-based AEMFCs achieve outstanding peak power densities of 2.50 W cm?2 in H2–O2 and ～1.41 W cm?2 in H2–air at 80 °C. Moreover, the present AEMFCs can run stably under 0.2 A cm?2 and 0.6 A cm?2 current densities at 70 °C for 265 h and 110 h, respectively, with low voltage decay rate of ～50 μV h?1.

Graphical abstract: Di-piperidinium-crosslinked poly(fluorenyl-co-terphenyl piperidinium)s for high-performance alkaline exchange membrane fuel cells
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