Over the last decade, anion-exchange membrane fuel cells (AEMFCs) have continued to show steady power output and durability improvements at low temperatures of 60°C–80°C. However, AEMFC durability still lags, largely due to the critical issue of water management. High-temperature operation (≥100°C) enables simplified water management, but additional material stability challenges remain, particularly concerning the chemical stability of the anion-exchange membranes (AEMs). Herein, we report the synthesis of lightly branched poly(arylene piperidinium) AEMs, leading to balanced water management and sufficient stability. The optimized membranes demonstrate high-temperature H/O AEMFC operation at 100°C, with a peak power density of ∼2 W cm and durability over a 195-h period under a constant current density of 600 mA cm with only ∼4% voltage decay. This work illustrates an effective AEM design strategy through high-temperature operation to resolve water management issues, thereby improving AEMFC performance and durability.

中文翻译：

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具有平衡水管理和增强稳定性的高温阴离子交换膜燃料电池

在过去的十年中，阴离子交换膜燃料电池 (AEMFC) 在 60°C–80°C 的低温下持续表现出稳定的功率输出和耐用性的提高。然而，AEMFC 的耐用性仍然滞后，这主要是由于水管理的关键问题。高温操作（≥100°C）可以简化水管理，但仍然存在其他材料稳定性挑战，特别是阴离子交换膜（AEM）的化学稳定性。在此，我们报告了轻支化聚（亚芳基哌啶）AEM 的合成，可实现平衡的水管理和足够的稳定性。优化的膜在 100°C 下表现出高温 H/O AEMFC 运行，峰值功率密度为 ∼2 W cm，在 600 mA cm 的恒定电流密度和仅 ∼4% 的电压下可耐用 195 小时。衰变。这项工作展示了一种有效的 AEM 设计策略，通过高温运行来解决水管理问题，从而提高 AEMFC 的性能和耐用性。