Oxygen- and proton-transporting open framework ionomer for medium-temperature fuel cells

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2024-09-05 DOI:10.1126/science.adq2259

Jianwei Yang, Hengyu Xu, Jie Li, Ke Gong, Feiyu Yue, Xianghao Han, Ke Wu, Pengpeng Shao, Qingling Fu, Yuhao Zhu, Wenli Xu, Xin Huang, Jing Xie, Fengchao Wang, Wenxiu Yang, Teng Zhang, Zengshi Xu, Xiao Feng, Bo Wang

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引用次数: 0

Abstract

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 H₂ and air, marking increases of 101 and 187%, respectively, compared with cells lacking the COF.

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用于中温燃料电池的氧和质子传输开放式框架离子聚合物。

与低温质子交换膜燃料电池相比，工作温度在 100° 至 120°C 的中温质子交换膜燃料电池（MT PEMFC）改善了动力学性能，简化了热管理和水管理，并扩大了燃料耐受性。然而，高温会导致 Nafion 离子膜脱水，并加剧气体输送的限制。受嗜热生物中渗透溶解物的启发，我们开发了与α-氨基酮连接的共价有机框架（COF）离聚物，与 Nafion 相互交织，作为 "可呼吸 "的质子导体。这种方法利用氢键的协同作用保留水分，增强了水合作用和质子传输，同时降低了氧气传输阻力。对于商用 Pt/C，MT PEMFC 在 105°C 温度下以 H2 和空气为燃料，阴极每毫克 Pt 的峰值功率密度和额定功率密度分别达到 18.1 瓦特和 9.5 瓦特，与缺乏 COF 的电池相比，分别提高了 101% 和 187%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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