Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China.
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China.
Nano Lett. 2023 Jun 14;23(11):5217-5226. doi: 10.1021/acs.nanolett.3c01201. Epub 2023 May 18.
MXenes are emerging 2D materials that have gained great attention because of their unique physical-chemical properties. However, the wide application of MXenes is prohibited by their high cost and environmentally harmful synthesis process. Here a fluoride- and acid-free physical vacuum distillation strategy is proposed to directly synthesize a series of MXenes. Specifically, by introducing a low-boiling-point element into MAX and subsequently evaporating A elements via physical vacuum distillation, fluoride-free MXenes (TiCT, NbCT, NbCT, TaCT, TiNT, TiCNT, etc.) are fabricated. This is a green and one-step process without any acid/alkaline involved and with all reactions inside a vacuum tube furnace, avoiding any contamination to external environments. Besides, the synthetic temperature is controlled to regulate the layered structures and specific surface areas of MXenes. Accordingly, the synthesized TiCT MXene exhibits improved sodium storage performance. This method may provide an alternative for the scalable production of MXenes and other 2D materials.
MXenes 是一种新兴的二维材料，由于其独特的物理化学性质而备受关注。然而，MXenes 的高成本和对环境有害的合成工艺限制了它们的广泛应用。在这里，提出了一种无氟和无酸的物理真空蒸馏策略，可直接合成一系列 MXenes。具体来说，通过在 MAX 中引入低沸点元素，然后通过物理真空蒸馏蒸发 A 元素，制备出无氟 MXenes（TiCT、NbCT、TaCT、TiNT、TiCNT 等）。这是一种绿色的一步法工艺，不涉及任何酸碱，所有反应都在真空管式炉内进行，避免了对外部环境的任何污染。此外，通过控制合成温度来调节 MXenes 的层状结构和比表面积。因此，合成的 TiCT MXene 表现出了改善的钠存储性能。这种方法可能为 MXenes 和其他二维材料的规模化生产提供了一种替代方案。
