Rapid and highly efficient C₃H₆/C₃H₈ separation over porous carbons is seriously hindered by the trade-off effect between adsorption capacity and selectivity. Here, we report a new type of porous carbon nanoplate (CNP) featuring an ultrathin thickness of around 8 nm and easily accessible ultramicropores (approximately 5.0 Å). The ultrathin nature of the material allows a high accessibility of gas molecules into the interior transport channels, and ultramicropores magnify the difference in diffusion behavior between C₃H₆ and C₃H₈ molecules, together ensuring a remarkable C₃H₆/C₃H₈ separation performance. The CNPs show a high and steady C₃H₆ capacity of up to 3.03 mmol g^–1 at 298 K during consecutive dynamic cycles, which is superior to that of the state-of-the-art porous carbons and even porous crystalline materials. In particular, the CNPs show a rapid gas diffusivity, which is 1000 times higher than that of conventional activated carbons. This research provides a promising design principle for addressing the selectivity-capacity trade-off for other types of adsorbent materials.

中文翻译：

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超越选择性-容量权衡：具有易于接近的超微孔的超薄碳纳米板用于高效丙烯/丙烷分离

吸附容量和选择性之间的权衡效应严重阻碍了多孔碳上快速高效的C ₃ H ₆ /C ₃ H _8分离。在这里，我们报告了一种新型多孔碳纳米板 (CNP)，其具有约 8 nm 的超薄厚度和易于接近的超微孔（约 5.0 Å）。材料的超薄特性允许气体分子高度进入内部传输通道，超微孔放大了 C ₃ H ₆和 C ₃ H ₈分子之间的扩散行为差异，共同确保了显着的 C ₃ H ₆ /C₃ H ₈分离性能。在连续动态循环期间，CNPs 在 298 K 下表现出高达 3.03 mmol g ^-1的高且稳定的 C ₃ H ₆容量，这优于最先进的多孔碳甚至多孔结晶材料。特别是，CNP 表现出快速的气体扩散率，比传统活性炭高 1000 倍。该研究为解决其他类型吸附材料的选择性-容量权衡问题提供了一个有前景的设计原则。