论文信息 - Planar electrochemical sensors based on tape-cast YSZ layers and oxide electrodes

Planar electrochemical sensors based on tape-cast YSZ layers and oxide electrodes

Abstract Electrochemical planar sensors based on yttria-stabilized zirconia (YSZ) with semiconducting oxides (WO 3 and LaFeO 3 ) and mixed conductors (La 0.8 Sr 0.2 FeO 3 ) as sensing electrodes were investigated. The electromotive force (EMF) of the sensors was measured at fixed temperature (450–700 °C) and different concentrations of NO 2 and CO in air in the range 20–1000 ppm. The sensors were wholly exposed to the same gas atmosphere, alternatively air and different gases in air, without using reference air. Fast and stable response was measured for all the different sensors. The EMF of p- and n-type semiconducting-based sensors was measured in opposite directions upon the same gas exposure. These results obtained for the response of planar sensors with different semiconductor sensing electrodes showed that the sensing mechanism cannot be explained by mixed potential theory. The response of these sensors is better described by a differential electrode equilibria sensing mechanism.

[1] Takashi Hibino,et al. Detection of propylene under oxidizing conditions using zirconia-based potentiometric sensor , 1998 .

[2] D. R. Brown,et al. Mixed potential sensors using lanthanum manganate and terbium yttrium zirconium oxide electrodes , 2002 .

[3] D. R. Brown,et al. CO/HC sensors based on thin films of LaCoO3 and La0.8Sr0.2CoO3−δ metal oxides , 2000 .

[4] E. Traversa,et al. Mechanism of LaFeO3 Perovskite-Type Oxide Formation from the Thermal Decomposition of d-f Heteronuclear Complex La[Fe(CN)6]-5H2O , 1996 .

[5] E. Traversa,et al. Electrochemical NO2 Sensors with WO3 Electrodes for High Temperature Applications , 2002 .

[6] Norio Miura,et al. Selective detection of NO by using an amperometric sensor based on stabilized zirconia and oxide electrode , 1999 .

[7] Maria Luisa Grilli,et al. Sensing Mechanism of Potentiometric Gas Sensors Based on Stabilized Zirconia with Oxide Electrodes Is It Always Mixed Potential , 2004 .

[8] Maria Luisa Grilli,et al. The NO2 response of solid electrolyte sensors made using nano-sized LaFeO3 electrodes , 2001 .

[9] Norio Miura,et al. Stabilized zirconia-based sensors using WO3 electrode for detection of NO or NO2 , 2000 .

[10] Norio Miura,et al. Mixed potential type sensor using stabilized zirconia and ZnFe2O4 sensing electrode for NOx detection at high temperature , 2002 .