在MFM-300材料中的高氨吸附:宿主-客体结合中的动力学和电荷转移
Xue Han1, Wanpeng Lu1, Yinlin Chen1
1Department of Chemistry, University of Manchester, Manchester M13 9PL, U.K.
Journal of the American Chemical Society
|February 19, 2021
概括
新的金属有机框架 (MOF) 具有较高的氨 (NH3) 吸附能力,为高效和可逆的储存提供了有希望的解决方案. 这些坚固的材料在能源技术中具有广泛应用的潜力.
科学领域:
- 材料科学
- 化学学
- 能量储存
背景情况:
- 氨 (NH3) 是一种高密度的载体,具有显著的能量潜力.
- 有效和耐用的储存材料对于氨的广泛应用至关重要.
- 现有的储存解决方案在效率和耐腐蚀方面存在局限性.
研究的目的:
- 研究新型金属有机框架 (MOF) 材料的氨吸附能力.
- 探索在MOF中吸附和储存氨的结构和化学机制.
- 评估基于MOF的氨储存系统的可逆性和循环性.
主要方法:
- 一系列MFM-300 (M) 金属有机框架的合成和表征 (M = Fe,V,Cr,In).
- 在冷温度 (273 K) 和环境压力 (1 bar) 下测量氨的吸附/脱吸.
- 先进的光谱技术包括现场中子粉散射,单晶X射线散射和电子磁共振光谱.
- 在现场无弹性中子散射和密度功能理论 (DFT) 建模以阐明结合动力学和宿主-客体相互作用.
主要成果:
- MFM-300(M) 材料具有很高的可逆氨吸附能力,MFM-300(VIV) 的吸附能力达到17.3 mmol g-1.
- 对于MFM-300 (M) (M=Fe,VIII,Cr) 的产能在20个周期以上仍然很高,显示出很好的可逆性.
- 证据表明宿主-客体电荷转移涉及氧化还原活性中心,导致VIV减小和氨氧化为 (N2H4).
结论:
- MFM-300 (M) 系列代表了一类具有特殊吸附和储存能力的强MOF.
- 氧化还原活性中心在促进电荷转移和增强氨吸收方面发挥着关键作用.
- 这些发现为基于MOF的氨吸附和转化提供了关键的见解,为先进的储能解决方案铺平了道路.
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