Study on the Deterioration Mechanism of Pb on TiO2 Oxygen Sensor

Duan, Chao; Zhang, Lejun; Wu, Zhaoxi; Wang, Xu; Meng, Meng; Zhang, Maolin

doi:10.3390/mi14010156

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Article

7 January 2023

8 Pages

Study on the Deterioration Mechanism of Pb on TiO₂ Oxygen Sensor

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China Aerospace Components Engineering Center, China Academy of Space Technology, Beijing 100081, China

School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710071, China

Author to whom correspondence should be addressed.

Micromachines2023, 14(1), 156;https://doi.org/10.3390/mi14010156

This article belongs to the Special Issue Oxide and Carbon Materials Based Sensors

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Abstract

Previous studies have shown that the pollutants in exhaust gas can cause performance deterioration in air-fuel oxygen sensors. Although the content of Pb in fuel oil is as low as 5 mg/L, the effect of long-term Pb accumulation on TiO₂ oxygen sensors is still unclear. In this paper, the influence mechanism of Pb-containing additives in automobile exhaust gas on the response characteristics of TiO₂ oxygen sensors was simulated and studied by depositing Pb-containing pollutants on the surface of a TiO₂ sensitive film. It was found that the accumulation of Pb changed the surface gas adsorption state and reduced the activation energy of TiO₂, thus affecting the steady-state response voltage and response speed of the TiO₂-based oxygen sensor.

Keywords:

TiO₂; oxygen sensor; lead contaminant; surface state

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