期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 2, 页码 2553-2563出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c04073
关键词
polybenzimidazole; block copolymer; imidazolium phosphotungstate; proton conductivity durability; organic-inorganic composite membranes; excellent PA retention capacity
资金
- Department of Science and Technology of Jilin Province [20180101209JC]
- Open Project of State Key Laboratory of Supramolecular Structure and Materials [sklssm2021022]
- Natural Science Foundation of China [s22075031]
Composite proton exchange membranes based on bPBI and PWA-IL filler were prepared. The membranes exhibited excellent mechanical properties and proton conductivity due to the unique structure of bPBI and the performance of PWA-IL.
Herein, composite proton exchange membranes based on block polybenzimidazole (bPBI) and a phosphotungstic acid-ionic liquid (PWA-IL) organic-inorganic filler have been prepared. The bPBI was prepared by block copolymerization of poly[2,2'-(p-phenylene)-5,5'-benzimidazole] and poly(4,4'-diphenylether-5,5'-bibenzimidazole) oligomers. bPBI combined the advantages of both rigid and flexible segments. The block structure of the segmented block copolymer helped build proton transmission channels and made the transmission of protons easier. The PWA-IL was evenly distributed in the membranes. The PWA-IL has good electrochemical properties and can also form hydrogen bonds with phosphoric acid (PA), which is beneficial to proton conduction. The membranes had excellent mechanical properties (11 MPa) owing to the low acid doping level (ADL). Moreover, the membranes exhibit 0.05 S cm(-1) proton conductivity at 170 degrees C at a low ADL and exhibit over 60% PA retention.
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