北京理工大学王博研究团队报道了用于中温燃料电池的氧和质子传递的开放框架离聚体。相关研究成果发表在2024年9月6日出版的国际学术期刊《科学》。

与低温质子交换膜燃料电池相比，在100°至120°C下运行的中温质子交换膜燃油电池（MT PEMFCs）具有更好的动力学、简化的热和水管理以及更宽的燃料耐受性。然而，高温会导致Nafion离聚物脱水，并加剧天然气输送的限制。

受超嗜热细胞中发现的渗透压物质的启发，研究人员开发了与Nafion交织的α-氨基酮连接的共价有机框架（COF）离聚物，作为“可呼吸”的质子导体。这种方法利用协同氢键来保持水分，增强水合作用和质子传输，同时降低氧气传输阻力。对于商用Pt/C，MT-PEMFCs在105°C的阴极上以H₂和空气为燃料，实现了每毫克Pt 18.1瓦和9.5瓦的峰值和额定功率密度，与没有COF的电池相比，分别增加了101%和187%。

附：英文原文

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

Author: 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

Issue&Volume: 2024-09-06

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.

DOI: adq2259

Source: https://www.science.org/doi/10.1126/science.adq2259