MXenes公司
材料科学
原子探针
氮化物
催化作用
纳米技术
碱金属
化学物理
卤素
碳化物
化学工程
无机化学
图层(电子)
冶金
化学
有机化学
透射电子显微镜
工程类
烷基
作者
M. J. Kramer,Bar Favelukis,Ayman A. El‐Zoka,Maxim Sokol,Brian A. Rosen,Noam Eliaz,Se‐Ho Kim,Baptiste Gault
标识
DOI:10.1002/adma.202305183
摘要
MXenes are a family of 2D transition metal carbides and nitrides with remarkable properties, bearing great potential for energy storage and catalysis applications. However, their oxidation behavior is not yet fully understood, and there are still open questions regarding the spatial distribution and precise quantification of surface terminations, intercalated ions, and possible uncontrolled impurities incorporated during synthesis and processing. Here, atom probe tomography (APT) analysis of as-synthesized Ti3 C2 Tx MXenes reveals the presence of alkali (Li, Na) and halogen (Cl, F) elements as well as unetched Al. Following oxidation of the colloidal solution of MXenes, it is observed that the alkalis are enriched in TiO2 nanowires. Although these elements are tolerated through the incorporation by wet chemical synthesis, they are often overlooked when the activity of these materials is considered, particularly during catalytic testing. This work demonstrates how the capability of APT to image these elements in 3D at the near-atomic scale can help to better understand the activity and degradation of MXenes, in order to guide their synthesis for superior functional properties.
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