在离子液中诱导域超高的溶性
Kun Li1,2, Yanlei Wang1,3, Chenlu Wang1
1Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Mesoscience and Engineering, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
离子液体 (IL) 具有极高的 (N2) 溶解度,显著提高了N2的捕获和转化. 密度能量 (FDE) 解释了这种增强的可溶性,指导了基于IL的先进技术的设计.
科学领域:
- 电化学
- 材料科学
- 化学工程
背景情况:
- 离子液体 (ILs) 以其优异的气体溶解性而闻名,特别是对于 (N2),这是电还原反应的关键因素.
- 基对N2溶解和IL溶解度的确切影响尚不完全理解.
研究的目的:
- 研究化功能组对各种离子液体中N2溶性的影响.
- 阐明在化IL中增强N2溶解性的机制,并建立定量关系.
主要方法:
- 进行了广泛的分子动力学模拟.
- 使用自由能量扰动方法分析N2在11个传统和9个化IL中的溶解度.
- 引入并使用密度能量 (FDE) 的概念.
主要成果:
- 化IL 1-乙基-3-甲基三 (pentafluoroethyl) 三酸盐 ([Emim]FAP) 的N2溶解度超高 (4.844 × 10−3),是[Emim]NO3的118倍.
- 具有超过10个C-F键的IL表现出更高的N2溶解度和外热溶解,而较少的C-F键导致溶解度和内热行为降低.
- 在FDE和C-F键数之间发现了线性相关性,较低的FDE与较低的N2-离子解离能量和较高的自由体积相关,从而提高了N2的溶性.
结论:
- 化IL,特别是具有广泛化的IL,提供了对N2电还原至关重要的优越N2溶解性.
- 密度能量 (FDE) 是理解和预测IL中的N2可溶性的关键参数.
- 这些发现为设计高效的N2捕获和转化技术的基于IL的先进材料提供了基础.
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