微孔芳香框架的热力学稳定功能化与硫酸组通过插入甲间隔器
Simon F Winterstein1, Michael Bettermann1, Jana Timm2
1Inorganic Chemistry III and Northern Bavarian NMR Centre, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany.
Molecules (Basel, Switzerland)
|April 13, 2024
概括
用甲基硫酸侧链合成新型多孔芳香框架 (PAF) 提高了质子交换应用的热稳定性. 这种修改后的PAF-303表现出显著的质子导电性,取决于吸收的水.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 纳米技术 纳米技术
背景情况:
- 由于可调性特性,孔隙芳香框架 (PAF) 正在被探讨为质子交换材料.
- 目前的局限性包括合成后改性硫酸组的热不稳定性.
研究的目的:
- 开发一个热稳定的多孔芳香框架,用于质子交换应用.
- 为了研究修改PAF的质子导电性作为含水量的函数.
主要方法:
- 对PAF-303进行两步后合成修改,以引入甲基二硫酸侧链 (SMPAF-303).
- 使用元素分析,NMR,电化学阻抗光谱和X射线光电子光谱进行表征.
- 在不同相对湿度 (RH) 中测量质子导电性.
主要成果:
- 成功合成了具有高热稳定性和1.7 mequiv g-1.1的离子交换能力的SMPAF-303.
- 质子导电性范围从10−7 S cm−1 (33%的RH) 到10−1 S cm−1 (100%的RH).
- 导电性受到水吸附的强烈影响,由于电解质聚类,在较低的RH处产生瓶效应.
结论:
- 甲基二硫酸侧链提高了PAF在质子导电方面的热稳定性.
- 水的扩散动力学受孔面极性和电解质聚类的影响,决定了质子导电性.
- 对于质子交换膜应用来说,SMPAF-303是有前途的,特别是在不同的湿度条件下.
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