用于中温燃料电池的氧和质子传输开放框架离聚物
Oxygen- and proton-transporting open framework ionomer for medium-temperature fuel cells.
作者信息
Yang Jianwei, Xu Hengyu, Li Jie, Gong Ke, Yue Feiyu, Han Xianghao, Wu Ke, Shao Pengpeng, Fu Qingling, Zhu Yuhao, Xu Wenli, Huang Xin, Xie Jing, Wang Fengchao, Yang Wenxiu, Zhang Teng, Xu Zengshi, Feng Xiao, Wang Bo
机构信息
Key Laboratory of Cluster Science, Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Frontiers Science Center for High Energy Material, Advanced Technology Research Institute (Jinan), School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230022, P. R. China.
出版信息
Science. 2024 Sep 6;385(6713):1115-1120. doi: 10.1126/science.adq2259. Epub 2024 Sep 5.
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 and air, marking increases of 101 and 187%, respectively, compared with cells lacking the COF.
与低温质子交换膜燃料电池相比，工作在100°至120°C的中温质子交换膜燃料电池（MT PEMFC）具有改善的动力学、简化的热管理和水管理，以及更宽的燃料耐受性。然而，高温会导致Nafion离聚物脱水，并加剧气体传输限制。受嗜热菌中发现的渗透剂的启发，我们开发了与Nafion交织的α-氨基酮连接的共价有机框架（COF）离聚物，以充当“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，同时降低氧气传输阻力。对于商业Pt/C，MT PEMFC在105°C下以氢气和空气为燃料时，在阴极处实现了每毫克Pt 18.1和9.5瓦的峰值和额定功率密度，与没有COF的电池相比，分别提高了101%和187%。
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