Limiting current type oxygen sensor with graded-composition layer electrode

Limiting current type oxygen sensors using a thin-film zirconia electrolyte and platinum electrodes have been reported previously. However, for this configuration, in which the electrolyte resistance is minimized, the sensor performance may be dominated by the electrode interface resistance. Accordingly, an improved sensor with graded-composition layer electrodes (GLE) has been developed to reduce the electrode interface resistance in such a device. Sensors fabricated with GLE displayed good linearity and high stability to oxygen concentrations from 0% to 100%, due to a decrease in the electrode interface resistance.