Obtaining Ambient‐Stable MXene Ti 3 C 2 T x through Avoidance of Surface Oxidation Active Sites

作者：Xuesong Li, Xue Ni, Qian Yao, Liuyuan Han, Xiangyan Zhao, Bo Li, Tao He, Xutang Tao · 发表于：Advanced Materials Interfaces · 年份：2022 · DOI：10.1002/admi.202200991 · 被引用次数：11 · 研究领域：MXene and MAX Phase Materials、Graphene and Nanomaterials Applications、2D Materials and Applications

Abstract As the quintessential representation of MXenes, Ti 3 C 2 T x has attracted widespread scientific interest and has demonstrated unparalleled potential in various applications. However, Ti 3 C 2 T x has always been subject to its ambient instability, which deteriorates the intrinsic properties and limits the practical applications. The mechanism responsible for oxidative degradation of Ti 3 C 2 T x has remained elusive, and the subsequent improvement of the preparation for ambient‐stable Ti 3 C 2 T x is still a challenge. In this paper, the ambient instability of Ti 3 C 2 T x is found to be attributed to the presence of many oxidation active sites on the surface, the formation of which is highly correlated with the enrichment of etching by‐products (AlF x or Al(OF) x ). Based on the above findings a slow‐speed etching method is designed, using tetramethylammonium hydroxide as a separate etching‐agent, to avoid adsorption of fluorine‐containing by‐products during etching. The prepared high‐quality Ti 3 C 2 T x flakes exhibit excellent ambient stability even after 4 months of dispersion in water, unlike conventional aqueous Ti 3 C 2 T x dispersions that can only be kept for a few days. The intrinsic stability allows Ti 3 C 2 T x to avoid its decomposition in seawater desalination, and it exhibits superior desalination ability with a maximum reduction of 62.2% in Na + permeability and a maximum increase of 300% in water flux.