Direct Operando Spectroscopic Observation of Oxygen Vacancies in Working Ceria-Based Gas Sensors

被引：31

作者：

Elger, Ann-Kathrin ^{[1
]}

Baranyai, Julian ^{[1
]}

Hofmann, Kathrin ^{[1
]}

Hess, Christian ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Eduard Zintl Inst Anorgan & Phys Chem, Alarich Weiss Str 8, D-64287 Darmstadt, Germany

来源：

ACS SENSORS | 2019年 / 4卷 / 06期

关键词：

oxygen vacancies; gas sensors; operando; ceria; gold; mechanisms; OXIDE; INSIGHTS;

D O I：

10.1021/acssensors.9b00521

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Metal-oxide semiconductors are of great interest for gas-sensing applications. We provide new insights into the mode of operation of ceria-based gas sensors during ethanol gas sensing using combined operando Raman-gas-phase FTIR spectroscopy. Visible Raman spectroscopy is employed to monitor the presence of oxygen vacancies in ceria via F-2g mode softening, while simultaneously recorded FTIR spectra capture the gas-phase composition. Such an experimental approach allowing the direct observation of oxygen vacancies in metal-oxide gas sensors has not been reported in the literature. By systematically varying the gas atmosphere and temperature, we can relate the sensor response to the spectroscopic signals, enabling us to obtain new fundamental insight into the functioning of metal-oxide semiconductor gas sensors, as well as their differences from heterogeneous catalysts.

引用

页码：1497 / 1501

页数：9

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