Nano-Micro Letters (Aug 2024)

Highly Sensitive Ammonia Gas Sensors at Room Temperature Based on the Catalytic Mechanism of N, C Coordinated Ni Single-Atom Active Center

  • Wenjing Quan,
  • Jia Shi,
  • Min Zeng,
  • Wen Lv,
  • Xiyu Chen,
  • Chao Fan,
  • Yongwei Zhang,
  • Zhou Liu,
  • Xiaolu Huang,
  • Jianhua Yang,
  • Nantao Hu,
  • Tao Wang,
  • Zhi Yang

DOI
https://doi.org/10.1007/s40820-024-01484-4
Journal volume & issue
Vol. 16, no. 1
pp. 1 – 17

Abstract

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Highlights Exploiting single-atom catalytic activation and targeted adsorption properties, Ni single-atom active sites based on N, C coordination are constructed on the surface of two-dimensional MXene nanosheets (Ni–N–C/Ti3C2Tx), enabling highly sensitive and selective NH3 gas detection. The catalytic activation effect of Ni–N–C/Ti3C2Tx effectively reduces the Gibbs free energy of the sensing elemental reaction, while its electronic structure promotes the spill-over effect of reactive oxygen species at the gas–solid interface. An end-sealing passivation strategy utilizing a conjugated hydrogen bond network of the conductive polymer was employed on MXene-based flexible electrodes, effectively mitigating the oxidative degradation of MXene-based gas sensors.

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