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Citation: HU Ming-Jiang,  LYU Chun-Wang,  WANG Xu-Rong,  NIU Zhe-Hui. Heterojunction LaCoO3/CeO2 Nanomaterial-based Gas Sensor for Formaldehyde Detection and Its Sensitive Mechanism[J]. Chinese Journal of Analytical Chemistry, ;2023, 51(2): 250-258. doi: 10.19756/j.issn.0253-3820.221395 shu

Heterojunction LaCoO3/CeO2 Nanomaterial-based Gas Sensor for Formaldehyde Detection and Its Sensitive Mechanism

  • 1.

    School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China;

  • 2.

    School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China

  • Corresponding author: HU Ming-Jiang, hu_mingjiang@163.com
  • Received Date: 2 August 2022
    Revised Date: 26 September 2022

    Fund Project: Supported by the Science and Technology Foundation of He′nan Province, China (No. 212102210199).

  • The LaCoO3 and LaCoO3/CeO2 nanomaterials were synthesized by sol-gel method, and the heterojunction formaldehyde gas sensor was designed by depositing the samples onto the alumina ceramic tube with Au electrodes by dip-coating method. The crystalline phase and microstructure of the samples were displayed using X-ray diffraction (XRD) and scanning electron microscope (SEM), and the electrochemical characteristic of the samples were analyzed by X-ray photoelectron spectroscopy (XPS). Density functional theory (DFT) was used to calculate the work function, total density of states and energy band of LaCoO3/CeO2 heterojunction, and the sensitization mechanism of sensor was further proposed for detecting formaldehyde in detail from the adsorption process of surface oxygen, heterojunction action and LaCoO3 catalytic oxidation process. Characteristic tests of formaldehyde gas sensor were carried out by WS-30A type multifunction analyzer in gas sensor test system. At the optimal operating temperature of 150 ℃, the maximum response of LaCoO3/CeO2 sensor to 20 μg/m3 formaldehyde gas reached 60.1. Meanwhile, the response time and recovery time of LaCoO3/CeO2 sensor were reduced to 5.6 and 9.8 s, respectively. The detection limit was 1.0 μg/m3 (S/N = 6). All the results demonstrated that LaCoO3 was an excellent catalyst for improving the gas-sensitive performance of metal oxide semiconductor sensors.
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