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论文类型：期刊论文

发表时间：2019-09-03

发表刊物：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录刊物：EI、SCIE

卷号：44

期号：42

页面范围：23750-23761

ISSN号：0360-3199

关键字：Branched polymer; Poly(ether ether ketone); Anion exchange membrane; Fuel cell

摘要：High-performance anion exchange membranes (AEMs) are in need for practical application of AEM fuel cells. Novel branched poly(ether ether ketone) (BPEEK) based AEMs were prepared by the copolymerization of phloroglucinol, methylhydroquinone and 4,4'-difluorobenzophenone and following functionalization. The effects of the branched polymer structures and functional groups on the membrane's properties were investigated. The swelling ratios of all the membranes were kept below 15% at room temperature and had good dimensional stability at elevated temperatures. The branching degree has almost no effect on the dimensional change, but plays a great role in tuning the nanophase separation structure. The cyclic ammonium functionalized membrane showed a lower conductivity but a much better stability than imidazolium one. The BPEEK-3-Pip-53 membrane with the branching degree of 3% and piperidine functionalization degree of 53% showed the best performances. The ionic conductivity was 43 mS cm(-1) at 60 degrees C. The ionic conductivity in 1 M KOH at 60 degrees C after 336 h was 75% of its initial value (25% loss of conductivity), and the IEC was 83% of its initial value (17% loss of IEC), suggesting good alkaline stability. The peak energy density (60 degrees C) of the single H-2/O-2 fuel cell with BPEEK-3-Pip-53 membrane reached 133 mW cm(-2) at 260 mA cm(-2). (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.