Pt-CeO₂ nanofibers based high-frequency impedancemetric gas sensor for selective CO and C₃H₈ detection in high-temperature harsh environment
2013
Liu, Yixin | Lei, Yu
High-temperature gas sensors are highly demanded to improve the combustion efficiency and reduce the emission of pollutant. In this study, Pt-CeO₂ nanofibers (Pt-CeO₂ NFs) were prepared using a facile two-step synthetic route (electrospinning followed by calcination). The impedance spectroscopy of the Pt-CeO₂ NFs based sensor was investigated in pure N₂ and different gas mixtures (O₂, CO, CO₂, NO, SO₂, and C₃H₈ balanced by N₂) with various concentrations at 800°C. For the first time, the sensor without solid electrolyte was operated at high frequency (100kHz), so that the sensor response towards O₂, CO₂, NO and SO₂ (balanced with N₂) was completely eliminated and strong reducing gases (e.g., CO and C₃H₈) can be selectively detected with good sensitivity, suggesting that high-frequency impedancemetric technique is a promising approach to improve the selectivity of high-temperature harsh environment gas sensors when operated at an appropriate frequency.
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