期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 43, 期 34, 页码 16694-16703出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.06.181
关键词
Proton exchange membrane; Phosphoric acid-doped branched polybenzimidazole; Effects of branched structures; Fuel cell
资金
- Natural Science Foundation of China [51773118]
- Natural Science Foundation of Guangdong Province [2015A030313546, 2017A030310653]
- Shenzhen Sci & Tech Research grant [JCYJ201303291 05010137, JCYJ 20150331142303052, ZDSYS2015071 41105130]
- Nanshan District Special Funds [FG2013JNYF0015A]
- Postdoctoral Research Foundation of Shenzhen Academy of Metrology & Quality Inspection [2016-YA38]
Highly branched copolymers have gained widespread attention due to their outstanding properties as proton exchange membranes (PEMs). However, the utilization of phosphoric acid-doped branched polybenzimidazole (PBI) as a PEM is rarely reported, and thus, the effects of branched structures on the properties of branched PBI membranes are not clear. In this work, three kinds of branched PBIs were prepared as high-temperature PEMs (HT-PEMs), and the branched polymer with the highest degree of branching was synthesized by introducing a branching agent with a large volume and rigid structure. In addition, the properties of the branched polymer membranes, such as the phosphoric acid doping content, proton conductivity, and oxidative stability, were characterized. The branched PBI membrane with the highest branching degree (9%) exhibited the highest proton conductivity (0.053 S cm(-1)) and resistance to oxidation (only 6.9% reduction in weight following immersion in Fenton's reagent for 180 h). Furthermore, the proton conductivity and branching. From these results, we infer that highly branched PBI is a promising material for application in the HT-PEMs of fuel cells. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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