期刊
FUEL CELLS
卷 20, 期 4, 页码 461-468出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.201900201
关键词
HT-PEFC; Ionic Liquids; PEFCs for Operation > 100 degrees C; Polymers; Proton Exchange Membranes; Proton Transport
资金
- Helmholtz society
- China Scholarship Council [201706060187]
- Projekt DEAL
Proton conducting ionic liquids (PILs) are discussed as new electrolytes for the use as non-aqueous electrolytes at operation temperatures above 100 degrees C. During fuel cell operation the presence of significant amounts of residual water is unavoidable. The highly Bronsted-acidic PIL 2-Sulfoethylmethylammonum triflate [2-Sema][TfO] is able to perform fast proton exchange processes with H2O, resulting from(1)H-NMR and pulsed field gradient (PFG)/diffusion ordered spectroscopy (DOSY) self-diffusion measurements. Proton conduction takes place by a vehicle mechanismviaPIL cations or H3O+, but also by a cooperative mechanism involving both species. Thus, highly Bronsted-acidic PILs are promising candidates for the use as non-aqueous electrolytes. To use [2-Sema][TfO] as electrolyte in a proton electrolyte fuel cell (PEFC) it has to be immobilized in a host polymer. There is a (slow) uptake of the PIL by polybenzimidazole (PBI) up to a weight increase of similar to 130%, due to a swelling process. A protonation of the basic imidazole moieties takes place. NMR analysis was applied to elucidate the molecular interactions between PBI, PIL, and residual water. Proton exchange, respectively an interaction between the polar groups and water can be observed in spectra, indicating a network of H-bonds in doped PBI. Therefore, highly acidic PILs are promising candidates for the use as non-aqueous electrolytes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据