Anion exchange membrane fuel cells (AEMFCs) have advanced rapidly in the past four years, while the majority of the state-of-the-art AEMFCs relies on unrealistic and uneconomical operating conditions, particularly a high hydrogen flow rate (>1000 mL min⁻¹). Here, we report a poly(fluorenyl aryl piperidinium) (PFAP) ionomer that enables high power of AEMFC with low hydrogen flow rate (≤100 mL min⁻¹ for 5 cm² cell). The high water permeability of the ionomer is beneficial to prevent anode flooding under moderate relative humidity. The relationship between hydrogen flow rate and limiting current density is revealed based on PFAP copolymers. Specifically, the peak power density of AEMFC is 1.77 W cm⁻² with a H₂ flow rate of 75 mL min⁻¹, retaining >70% power density from the H₂ flow rate of 1000 mL min⁻¹ (2.42 W cm⁻²). Importantly, the present AEMFCs display much higher hydrogen utilization efficiency above 90% and hydrogen fuel power (∼30 W cm⁻² L⁻¹) than previously reported AEMFCs (<30% and 0.4–3.5 W cm⁻² L⁻¹). Moreover, the present AEMFCs show stable cell performance with a low hydrogen flow rate at 70 °C for >110 h.

阴离子交换膜燃料电池 (AEMFC) 在过去四年中发展迅速，而大多数最先进的 AEMFC 依赖于不切实际和不经济的操作条件，尤其是高氢气流速（>1000 mL min ^{- 1}）。在这里，我们报告了一种聚（芴基芳基哌啶鎓）（PFAP）离聚物，它能够以低氢气流速（5 cm ²电池≤100 mL min ^-1）实现高功率的 AEMFC 。离聚物的高透水性有利于在中等相对湿度下防止阳极水淹。基于PFAP共聚物揭示了氢气流速和极限电流密度之间的关系。具体而言，AEMFC 的峰值功率密度为 1.77 W cm ^-2，H ₂75 mL min ^{-1 的}流速，与 1000 mL min ^-1 (2.42 W cm ^-2 )的 H ₂流速相比，保持 >70% 的功率密度。重要地，本AEMFCs显示90％以上的高得多的氢的利用效率和氢燃料功率（约30 w ^厘米^-2 大号^-1比先前报道AEMFCs）（<30％和0.4-3.5W¯¯厘米^-2 大号^-1）。此外，目前的 AEMFC 显示出稳定的电池性能，在 70°C 下氢气流速较低，持续时间超过 110 小时。