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发布时间：2019-03-11

论文类型：期刊论文

发表时间：2018-04-15

发表刊物：JOURNAL OF MEMBRANE SCIENCE

收录刊物：EI、SCIE

卷号：552

页面范围：286-294

ISSN号：0376-7388

关键字：Anion exchange membrane; Ion-conducting channel; Imidazolium; Oligo(ethylene glycol); DFT study

摘要：A high performance of anion exchange membranes (AEMs) is highly demanded in anion exchange membrane fuel cells (AEMFCs) and has been extensively studied. However, the poor ionic conductivities and the alkaline stability might limit their applications. Herein, we developed a novel strategy to improve the ionic conductivity and alkaline stability of AEMs by introducing hydrophilic oligo(ethylene glycol)(OEG) groups. Continuous ion-conducting channels were efficiently formed thanks to the dynamic aggregation of water molecules assisted by the hydrophilic side chains. The resultant AEMs with low IEC values showed significant enhancement in hydroxide conductivity compared to the AEMs functionalized by the conventional 1,2-dimethylimidazolium (PSf-Im), as the hydroxide conductivity of PSf-2 membrane with an IEC of 1.05 mmol g(-1) was 59.5 mS.cm(-1) at 60 degrees C while the hydroxide conductivity of PSf-Im membrane with an IEC of 1.27 mmol g(-1) was 36.7 mS.cm(-1). In addition, the alkaline stability and the mechanical properties of the resultant AEMs were improved remarkably. The density functional theory (DFT) study showed that the introduction of OEG part can significantly increase the LUMO energy of functional group and then enhance the alkaline stability.