作为超高超质子导体的环形三脚受体
Debolina Mukherjee1, Shyam Chand Pal1, Shuailong Zhang2
1Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India.
Angewandte Chemie (International ed. in English)
|September 15, 2025
概括
新的三脚受体增强了燃料电池固态质子导体 (SSPC) 中的质子导电性. 由于优化的键架构,Tripod-COOH-P的导电性明显高于Tripod-NO2-P.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 超分子化学 超分子化学
背景情况:
- 质子交换膜燃料电池 (PEMFC) 需要具有高导电性和稳定的固态质子导体 (SSPC).
- 从传统的SSPC中出酸仍然是一个重大挑战.
- 循环超分子化学为设计功能性材料提供了新的策略.
研究的目的:
- 开发一种基于键平台的新一类导质子三脚受体.
- 研究结构工程对质子导电性和稳定性的影响.
- 为解决SSPC中酸浸出问题.
主要方法:
- 合成两个三脚受体:三脚-COOH-P和三脚-NO2-P,具有明显的功能尾巴.
- 宿主-客人相互作用以在受体框架内定质子载体 (H3PO4和H2PO4-).
- 在80°C和80%的相对湿度 (RH) 中测量了质子导电性.
- 量子化学模拟以确定质子转移能量障碍 (E_PT).
主要成果:
- 三脚架-COOH-P的质子导电率为1.5 × 10^-2 S cm^-1,比三脚架-NO2-P (3.08 × 10^-5 S cm^-1) 高出三个数量级.
- 结构变化,包括键架构 (连续与闭环),显著影响了导电性.
- 量子化学模拟显示,与Tripod-NO2-P (24.9 kcal mol^-1) 相比,Tripod-COOH-P (13.7 kcal mol^-1 和 1.7 kcal mol^-1) 的E_PT较低.
- 在Tripod-COOH-P中观察到一个能量有利的量子道效应.
结论:
- 开发的三脚受体有效地定质子载体,减轻漏问题.
- 三脚架-COOH-P表现出异常的质子导电性,将其确立为一个有前途的超高质子导电平台 (>10^-2 S cm^-1).
- 通过互补的对接策略来定制键架构对于优化SSPC性能至关重要.
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