设计,制备和高内在质子导电性两个高度稳定的酸链接的共价有机框架的设计,制备和高内在质子导电性
Shuai-Long Zhang1, Zhong-Cheng Guo1, Kaiyin Xu1
1College of Chemistry and Green Catalysis Center, Zhengzhou University, 450001 Zhengzhou, Henan, China.
ACS applied materials & interfaces
|June 29, 2023
概括
两种新的联共价有机框架 (COFs),TpBth和TaBth,表现出高稳定性和质子导电性,为能源应用提供了Nafion膜的潜在替代品.
科学领域:
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
- 共价有机框架 (COFs) 是一种共价有机框架.
背景情况:
- 开发稳定,质子导体材料对于推进燃料电池等能源技术至关重要.
- 纳膜虽然已经成熟,但在某些条件下,其稳定性和导电性受到限制.
- 性有机框架 (COFs) 是一种有前途的材料类,可用于质子导电,因为它们的可调结构和高表面积.
研究的目的:
- 合成和表征具有增强稳定性和质子导电性的新型联COF.
- 研究这些COF的结构性质与它们的质子导电机制之间的关系.
- 评估这些COF作为传统质子交换膜的替代品的潜力.
主要方法:
- 使用特定的单体 (Bth, Tp, Ta) 合成两种与酸结合的COF (TpBth和TaBth) 的溶热合成.
- 使用材料工作室8.0模拟和粉末X射线衍射 (PXRD) 的结构特征.
- 在不同温度和湿度条件下通过交流阻抗光谱测量质子导电性.
主要成果:
- 通过2D框架和AA包装成功合成了TPBth和TABthCOF.
- 证明了超高的水稳定性和高的吸水能力,归因于碳基和-NH-NH2组.
- 取得了显著的水辅助质子导电性 (σ) 值,达到2.11 × 10−4 S·cm−1的TpBth在100°C/98%RH.
- 通过结构分析,气体吸附和激活能计算,阐明了质子导电机制.
结论:
- 合成的联COFs (TpBth和TaBth) 显示出极好的稳定性和有前途的质子导电性.
- 这些COF为为能源应用开发下一代质子交换膜提供了可行的途径.
- 该研究为设计高性能质子导电COF提供了有价值的见解.
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