In-situ doping nickel single atoms in two-dimensional MXenes analogue support for room temperature NO2 sensing

被引：0

作者：

Weiming Chen

Peipei Li

Jia Yu

Peixin Cui

Xiaohu Yu

Weiguo Song

Changyan Cao

机构：

[1] Chinese Academy of Sciences,Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Laboratory of Molecular Nanostructures and Nanotechnology, Institute of Chemistry

[2] University of Chinese Academy of Sciences,School of Chemical Sciences

[3] Chinese Academy of Sciences,Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science

[4] Shaanxi University of Technology,Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Sciences

来源：

Nano Research | 2022年 / 15卷

关键词：

MXenes; single atom; NO; sensing; molten salt;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

MXenes are promising supports for anchoring metal single atoms due to their versatile composition, well-defined nanostructures, and suitable conductivity. However, metal single atoms are usually coordinated with surface terminal groups (-O, -OH, -Cl, etc.) of MXenes via conventional wet-impregnation, resulting in limited electronic structure modification. Through a NiCl2 molten salt etching method, we observed that Ni single atoms could be in-situ doped in the lattice of MXenes analogue TiC0.5N0.5 support (denoted as Ni1/TiC0.5N0.5), resulting in much larger charge transfer from Ni atoms to adjacent Ti atoms, and thus increasing the electronic density of these Ti atoms. When used for NO2 sensing, Ni1/TiC0.5N0.5 exhibited excellent response sensitivity (ultra-low limit of detection ∼ 10 ppb), selectivity, and good stability at room temperature. This study provides an effective strategy for producing MXenes analogue supported metal single atoms for potential application in gas sensing.

引用

页码：9544 / 9553

页数：9