期刊
JOURNAL OF MEMBRANE SCIENCE
卷 581, 期 -, 页码 293-302出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2019.03.054
关键词
4-(dimethylamino)butyraldehyde diethyl acetal; Anion exchange membrane; Conductivity; Alkaline stability; LUMO energy
资金
- National Natural Science Foundation of China [21776042]
- Science and Technology Innovation Fund of Dalian [2018J12GX052]
- National Key Research and Development Program of China [2016YFB0101203]
- China MOST (Ministry of Science and Technology) innovation team in key areas [2016RA4053]
The anion exchange membranes (AEM) is one of the key components for alkaline electrolyte membrane fuel cells. However, poor alkaline stability and conductivity of the membrane greatly hinders its practical application. Herein, we report a novel 4-(dimethylamino)butyraldehyde diethyl acetal (DABDA) quaternized polysulfone AEM, or PSf-DABDA, which shows improved conductivity and alkaline stability due to the better hydrophilicity and the electron donating effect imparted by the long alkyl substituent with two ether-containing moieties in the cation structure. Its room temperature conductivity reaches 21 mS/cm while that of trimethylamine (TMA)- and dimethylbutylamine (DMBA) quaternized AEMs with comparable ion exchange capacity (IEC) is 11.8 and 13.2 mS/cm, respectively. When treated 150 h in 1 M NaOH at 60 degrees C, the PSf-DABDA membrane experiences a slight conductivity decrease of 5% while the PSf-TMA and PSf-DMBA membranes with a comparable IEC suffer a more serious conductivity decay of 19 and 13.5%, respectively. The better alkali stability of PSf-DABDA over its counterparts is further confirmed by a density functional theoretical study and a structural characterization before and after the alkali treatment. Our work demonstrates the advantage of the DABDA cation by both experimental and computational study; it presents a new possibility of improving AEM conductivity and stability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据