Medium-temperature proton exchange membrane fuel cells (MT PEMFCs) operating at 100° to 120°C have improved kinetics, simplified thermal and water management, and broadened fuel tolerance compared with low-temperature PEMFCs. However, high temperatures lead to Nafion ionomer dehydration and exacerbate gas transportation limitations. Inspired by osmolytes found in hyperthermophiles, we developed α-aminoketone–linked covalent organic framework (COF) ionomers, interwoven with Nafion, to act as “breathable” proton conductors. This approach leverages synergistic hydrogen bonding to retain water, enhancing hydration and proton transport while reducing oxygen transport resistance. For commercial Pt/C, the MT PEMFCs achieved peak and rated power densities of 18.1 and 9.5 Watts per milligram of Pt at the cathode at 105°C fueled with H 2 and air, marking increases of 101 and 187%, respectively, compared with cells lacking the COF.

中文翻译：

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用于中温燃料电池的氧和质子传输开放框架离聚物


与低温 PEMFC 相比，在 100°C 至 120°C 温度下运行的中温质子交换膜燃料电池 (MT PEMFC) 改善了动力学，简化了热和水管理，并扩大了燃料耐受性。然而，高温会导致 Nafion 离聚物脱水并加剧气体运输限制。受到嗜热菌中发现的渗透剂的启发，我们开发了 α-氨基酮连接的共价有机骨架 (COF) 离聚物，与 Nafion 交织，充当“透气”质子导体。这种方法利用协同氢键来保留水分，增强水合作用和质子传输，同时降低氧传输阻力。对于商用 Pt/C，MT PEMFC 在 105°C 以 H 2 和空气为燃料的情况下，在阴极处实现了每毫克 Pt 18.1 瓦和 9.5 瓦的峰值功率密度和额定功率密度，与相比，分别提高了 101% 和 187%缺乏 COF 的细胞。