WO_3を電極補助相とする高温用電気化学NO_2センサー

概要

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Electrochemical NO_x sensors for high temperature applications were prepared coupling pellets of yttriastabilized zirconia (YSZ) , an oxygen ion conductor, with a thick film of a semiconducting oxide (WO_3) as an auxiliary phase. The obtained sensors were exposed to the same atmosphere without the use of reference air. Electromotive force (EMF) , polarization curves and amperometric measurements were performed in air and at different concentrations of NO_2 in air, at selected temperatures. Stable EMF values and fast response times were obtained. The sensors showed non-linear polarization curves. The role played by the electrolyte/ electrode interface was determined by electrochemical impedance spectroscopy (EIS) tests: exposure to NO_2 did not affect the bulk but only the electrolyte/electrode interface.
社団法人日本セラミックス協会の論文
2002-03-01