期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 353, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.131155
关键词
Mn-doped Co3O4; Toluene; Gas sensing; in situ DRIFTS; Sensing mechanism
资金
- National Natural Science Foundation of China [21822601, 22176029]
- Excellent Youth Foundation of Sichuan Scientific Committee Grant in China [2021JDJQ0006]
- Fundamental Research Funds for the Central Universities [ZYGX2019Z021]
- 111 Project [B20030]
This study synthesized Mn-doped Co3O4 porous nanosheets with higher response and shorter response/recovery time, and investigated the gas-solid interfacial sensing mechanism through DRIFTS, revealing the reaction species generated during toluene gas sensing process.
Unraveling the gas-solid interfacial sensing mechanism during gas sensing is very essential for the development of high-performance gas sensors. In this work, the Mn-doped Co3O4 porous nanosheets with 5.6 times higher response than pristine Co3O4 and short response/recovery time (55/30 s) for 100 ppm toluene gas is synthesized. More importantly, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is conducted to investigate the gas-solid interfacial sensing mechanism over 3-Mn-Co3O4. The interfacial reaction species have been monitored, such as methylbenzene, benzyl alcohol, benzaldehyde, benzoic acid, carbon monoxide, and water molecule. These species originate from the elementary and overall reactions during toluene gas sensing. The dynamic evolution of surface species could be divided into three stages of adsorption reaction, reaction balance, and desorption reaction. Furthermore, combined with the density function theory simulation calculation, the gas-solid interfacial sensing mechanism over 3-Mn-Co3O4 is proposed. Toluene molecule reacts with the surface active oxygen species resulting in the occurrence of a series of elementary reactions and the generation of intermediates. The products of overall reaction are CO2 and H2O during gas sensing. Our work implements a meaningful exploration of in situ DRIFTS in gas-sensing field and provides a distinctive view to understand the gas-soild interfacial gas-sensing mechanism.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据