个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 精细化工国家重点实验室主任,教育部智能材料化工前沿科学中心执行主任,大连理工大学膜科学与技术研究开发中心主任
性别:女
毕业院校:中国科学院大连化物所
学位:博士
所在单位:化工学院
学科:化学工程. 膜科学与技术. 生物医学工程
联系方式:hgaohong@dlut.edu.cn
电子邮箱:hgaohong@dlut.edu.cn
Flexibly crosslinked and post-morpholinium-functionalized poly(2,6-dimethyl-1,4-phenylene oxide) anion exchange membranes
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论文类型:期刊论文
发表时间:2021-02-02
发表刊物:INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷号:45
期号:54,SI
页面范围:29681-29689
ISSN号:0360-3199
关键字:Anion exchange membrane; Morpholinium; Fuel cell; Flexible cross-linking; Post-functionalization
摘要:Morpholinium-functionalized cross-linked poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) anion exchange membranes were prepared using a crosslinking/post-functionalization method. 4,4'-(oxybis(ethane-2,1-diyl)) dimorpholine (OEDM) having a flexible long chain and hydrophilic ether bond was for the first time used as the crosslinker. The brominated PPO reacted with OEDM, forming a crosslinked structure and accomplishing partial functionalization. Further functionalization was carried out by immersion in N-methyl- morpholine aqueous solution. The degree of crosslinking was controlled by varying the proportion of brominated PPO to OEDM because excessive bromomethyl groups ensured the occurrence of crosslinking reaction. The cross-linked structure promoted the formation of micro-phase separation and effectively limited swelling. The crosslinked membrane shows much higher conductivity and lower swelling ratio compared to non-crosslinked one at similar IEC. The highest hydroxide conductivity that the crosslinked membrane achieves is 35 mS cm(-1)- at 20 degrees C. The power density for the H-2/O-2 single cell assembled with this membrane is up to 193 mW cm(-2). In addition, the crosslinked PPO-MmOH-Cr membrane exhibits good alkaline stability with conductivity loss of less than 15% after soaking in 1 M KOH for 96 h. (C) 2019 Hydrogen Energy Publications LLC. (C) Published by Elsevier Ltd. All rights reserved.