Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 602, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2020.117981
Keywords
Phosphoric acid-doped polybenzimidazoles (PA-PBIs); Star-shaped branched block matrix; High-temperature proton exchange membrane; Fuel cell
Categories
Funding
- National Natural Science Foundation of China [51773118]
- Shenzhen Sci Tech Bureau [JCYJ20170818093417096]
- Shenzhen University [2018040, 2016003]
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The application of phosphoric acid (PA)-doped polybenzimidazoles (PBIs) in high-temperature proton exchange membrane fuel cells (HTPEMFCs) requires optimal proton conductivity and fuel cell performance. Recently, we found that branched PBIs could absorb more PA due to their large free volume, and block PBIs could yield obvious nanophase-separated structures, both of which were beneficial to proton transportation. Herein, by constructing a branched PBI core block with another derived PBI structure, a novel membrane with a star-shaped, branched block matrix was prepared for the first time. The dendritic polymer backbone with a phase separation path endows the membranes with high PA doping capacity and high-efficiency proton transmission. Noticeably, a high proton conductivity (0.15 S cm(-1), 160 degrees C) and low activation energy (5.6 kJ mol(-1)) were obtained under anhydrous conditions, and the peak power density of the single-cell test was as high as 713 mW cm(-2) at 160 degrees C. The results indicate that the combination of branching and a block structure is promising for actual use in HTPEMFCs.
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