硫酸盐-碳酸盐Cu-MOFs的pH依赖结构工程,用于高质子导电性
Shiyu Wei1, Tingting Cui2,3, Shunlin Zhang1
1Guizhou Key Laboratory of Macrocyclic and Supramolecular Chemistry, Guizhou University, Guiyang 550025, China.
Inorganic chemistry
|April 23, 2025
概括
合成了两种新的基于铜的金属有机框架 (MOF). 一个MOF由于其结构和功能组显著增强了质子导电性,为先进的固态质子导体铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 纳米技术 纳米技术
背景情况:
- 含有碳酸 (COOH) 基的金属有机框架 (MOF) 因其布伦斯特德酸度和结能力而被研究固态质子导电.
- 控制MOF的结构和功能组对于优化它们的质子导电性至关重要.
研究的目的:
- 通过调整反应pH,合成两个不同的基于铜的MOF (Cu-MOF).
- 为了研究pH控制的连接体去化对MOF结构和维度的影响.
- 为了评估和比较合成的MOFs的质子导电性.
主要方法:
- 合成两个Cu-MOFs,CuDSOA-1和CuDSOA-2,使用二-2,2'-二硫酸盐-4,4'-氧化酸 (Na2H2DSOA) 和4,4'-双 (4,4'-bpy) 连接物.
- 对反应溶液的pH值进行调整,以影响碳酸脱和联体协调.
- 描述MOF结构和测量在不同温度和相对湿度 (RH) 下的质子导电性.
- 使用-同位素效应证实了质子导电机制.
主要成果:
- 成功合成了两个具有不同尺寸和结构的Cu-MOF,CuDSOA-1和CuDSOA-2.
- CuDSOA-1,具有丰富的COOH组和无协调的硫酸盐组,显示出显著增强的质子导电性 (2.46 × 10−2 S cm−1在95°C,98%RH).
- CuDSOA-2 呈现较低的质子导电性 (3.40 × 10−5 S cm−1 在 85 °C, 98% RH).
- 在CuDSOA-1中,质子导电性遵循一个Grotthuss机制.
结论:
- 调节pH值是一种有效的策略,可以控制硫酸-碳酸的协调,并为质子导电性量身定制MOF结构.
- CuDSOA-1代表了高性能固态质子导体的有希望的材料.
- 这项工作为设计具有超高质子导电性的MOF提供了洞察力.
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