Study on the Deterioration Mechanism of Pb on TiO2 Oxygen Sensor

被引：2

作者：

Duan, Chao ^{[1
]}

Zhang, Lejun ^{[2
]}

Wu, Zhaoxi ^{[1
]}

Wang, Xu ^{[1
]}

Meng, Meng ^{[1
]}

Zhang, Maolin ^{[2
]}

机构：

[1] China Acad Space Technol, China Aerosp Components Engn Ctr, Beijing 100081, Peoples R China

[2] Xidian Univ, Sch Adv Mat & Nanotechnol, Xian 710071, Peoples R China

来源：

MICROMACHINES | 2023年 / 14卷 / 01期

基金：

中国国家自然科学基金;

关键词：

TiO2; oxygen sensor; lead contaminant; surface state; PERFORMANCE; TEMPERATURE;

D O I：

10.3390/mi14010156

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页数：8

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