N-doped three-dimensional needle-like CoS2 bridge connection Co3O4 core-shell structure as high-efficiency room temperature NO2 gas sensor

Xue Bai; Zhuo Liu; He Lv; Junkun Chen; Mawaz Khan; Jue Wang; Baihe Sun; Yang Zhang; Kan Kan; Keying Shi

doi:10.1016/j.jhazmat.2021.127120

N-doped three-dimensional needle-like CoS₂ bridge connection Co₃O₄ core-shell structure as high-efficiency room temperature NO₂ gas sensor

J Hazard Mater. 2022 Feb 5;423(Pt B):127120. doi: 10.1016/j.jhazmat.2021.127120. Epub 2021 Sep 4.

Authors

Xue Bai¹, Zhuo Liu¹, He Lv¹, Junkun Chen¹, Mawaz Khan¹, Jue Wang², Baihe Sun¹, Yang Zhang¹, Kan Kan³, Keying Shi⁴

Affiliations

¹ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education. School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China.
² Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education. School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China; Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
³ Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China. Electronic address: kankan.has@foxmail.com.
⁴ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education. School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, PR China. Electronic address: shikeying2008@163.com.

PMID: 34530272
DOI: 10.1016/j.jhazmat.2021.127120

Abstract

The N-doped three-dimensional (3D) needle bridge connection core-shell structure N-CoS₂@Co₃O₄ synthesized in this work was prepared by simple hydrothermal and high-temperature vulcanization methods. The optimized N-CoS₂@Co₃O₄^-2 composite response to NO₂ is 62.3-100 ppm, a response time of 1.3 s, the recovery time of 17.98 s, the detection limit of 5 ppb and stability of as long as 10 weeks at room temperature (RT). Its excellent NO₂ sensing performance is attributed to the unique porous and bridge connection core-shell structure of the N-CoS₂@Co₃O₄^-2 with high specific surface area, interconnected internal channels, abundant exposed S edge active sites, and high catalytic performance promoted by N-doping. This simple manufacturing method of high-performance sensing materials paves the way for the design of N-doped bridge connection core-shell structures.

Keywords: Bridge connection core–shell structure; High sensitivity; N-doped; P-p heterojunction; Room-temperature NO(2) sensors.