基于MOF的高效质子导体中的独特质子动力学
Yong-Sheng Wei1, Xiao-Peng Hu1, Zhen Han1
1College of Chemistry and Molecular Engineering, Zhengzhou University , Zhengzhou 450001, China.
Journal of the American Chemical Society
|February 15, 2017
概括
研究人员合成了一种新的导质子金属有机框架 (MOF),可以在链上促进质子转移. 这种MOF具有显著的无水和水辅助导电性,具有观察到的质子动态和独特的单晶转化.
科学领域:
- 材料科学
- 化学学
- 固态化学
背景情况:
- 金属有机框架 (MOF) 正成为有前途的质子导电材料.
- 在晶体材料中直接观察质子转移机制仍然是一个重大挑战.
- 了解质子动态对于开发先进的质子导体至关重要.
研究的目的:
- 合成和描述一种新的导质子MOF.
- 研究MOF结构中的质子转移机制.
- 评估材料的无水和水辅助质子导电性.
主要方法:
- (Me2NH2) [Eu(L) ]MOF的溶热合成
- 在单晶和颗粒上进行异位导电性测量.
- 在现场可变温度表征:PXRD,SCXRD,DRIFTS和光发光.
- 控制实验以确认质子动态.
主要成果:
- 合成的MOF, (Me2NH2) [Eu(L) ],呈现出具有质子导电的N-H··O链的分层结构.
- 在150°C时,单晶无水电导率为1.25 × 10−3 S·cm−1.
- 在100°C和98%的RH下,水辅助的质子导电率达到3.76 × 10−3 S·cm−1.
- 直接观察N-H·O链中的质子振动和转移.
- 发现了一种罕见的单晶到单晶 (SCSC) 转化,涉及质子转移.
结论:
- (Me2NH2) [Eu(L] MOF通过明确的键链表现出高效的质子导电性.
- 这项研究直接证实了晶体材料中的质子动态.
- 观察到的SCSC转换提供了对MOF结构灵活性和质子转移途径的见解.
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