Electrochemical cells were prepared coupling an oxygen ionic conductor (Y2O3-stabilized ZrO2:YSZ) with a semiconducting oxide (LaFeO3) electrode. Pt was used as the counter electrode. These devices showed promising NO2 sensing performance at 400 and 450 degreesC. The electromotive force (EMF) value of the (Pt)LaFeO3/YSZ/Pt sensor increased in NO2 atmospheres with a fast response time. The polarization curves showed non-linear behavior in air and NO2. The non-linearity was attributed to the potential drop at the electrode interfaces. Electrochemical impedance spectroscopy (EIS) analysis of the devices showed that the resistance and reactance at the electrolyte/electrode interface decreased upon introduction of 100 ppm NO2 in air, because of a lower electrode overvoltage. (C) 2001 Elsevier Science B.V. All rights reserved.
Yoon, J., Grilli, M., DI BARTOLOMEO, E., Polini, R., Traversa, E. (2001). The NO2 response of solid electrolyte sensors made using nano-sized LaFeO3 electrodes. In Sensors and Actuators, B: Chemical (pp.483-488). LAUSANNE : ELSEVIER SCIENCE SA [10.1016/S0925-4005(01)00594-9].
The NO2 response of solid electrolyte sensors made using nano-sized LaFeO3 electrodes
DI BARTOLOMEO, ELISABETTA;POLINI, RICCARDO;TRAVERSA, ENRICO
2001-01-01
Abstract
Electrochemical cells were prepared coupling an oxygen ionic conductor (Y2O3-stabilized ZrO2:YSZ) with a semiconducting oxide (LaFeO3) electrode. Pt was used as the counter electrode. These devices showed promising NO2 sensing performance at 400 and 450 degreesC. The electromotive force (EMF) value of the (Pt)LaFeO3/YSZ/Pt sensor increased in NO2 atmospheres with a fast response time. The polarization curves showed non-linear behavior in air and NO2. The non-linearity was attributed to the potential drop at the electrode interfaces. Electrochemical impedance spectroscopy (EIS) analysis of the devices showed that the resistance and reactance at the electrolyte/electrode interface decreased upon introduction of 100 ppm NO2 in air, because of a lower electrode overvoltage. (C) 2001 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
