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Research Article

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

Weiming Chen1,2,§, Peipei Li1,2,§, Jia Yu1,2, Peixin Cui3, Xiaohu Yu4(), Weiguo Song1,2(), Changyan Cao1,2()
Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Laboratory of Molecular Nanostructures and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Sciences, Shaanxi University of Technology, Hanzhong 723000, China

§ Weiming Chen and Peipei Li contributed equally to this work.

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Graphical Abstract

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Through a NiCl2 molten salt etching method, Ni single atoms could be in-situ doped in the lattice of MXenes analogue support, resulting in much larger charge transfer from Ni atoms to adjacent Ti atoms, and thus increasing the electronic density of these Ti atoms for NO2 sensing at room temperature.

Abstract

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.

Keywords

MXenessingle atomNO2sensingmolten salt

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Nano Research
Volume 15 Issue 10,
October 2022
Pages 9544-9553
DOI: 10.1007/s12274-022-4904-3
Cite this article:
Chen W, Li P, Yu J, et al. In-situ doping nickel single atoms in two-dimensional MXenes analogue support for room temperature NO2 sensing. Nano Research, 2022, 15(10): 9544-9553. https://doi.org/10.1007/s12274-022-4904-3
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