High-temperature sensors for NO and NO₂ based on stabilized zirconiaand spinel-type oxide electrodes

Abstract

Zirconia-based electrochemical devices attached with an oxide sensing electrode have been examined for gas sensing properties towards NO and NO₂ at high temperature. Among the twelve kinds of spinel-type oxides tested, CdCr₂O₄ was the most sensitive electrode material to both NO and NO₂ in air at 500–600 °C, also being endowed with quick response and recovery characteristics. Values of E_EMF of the CdCr₂O₄-attached device decreased or increased linearly with an increase in the logarithm of NO or NO₂ concentration, respectively. The same device gave small or insignificant cross-sensitivities to H₂ , CO, CH₄ , CO₂ and H₂O. Sensing mechanisms involving mixed potential were confirmed from the measurements of polarization curves.

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