Abstract
An yttria-stabilized zirconia (YSZ)-based sensor utilizing a Zn-Ta-based oxide sensing electrode (SE) is reported herein as being capable of generating sensitive and selective response toward hydrogen (H2). The addition of 84 wt.% Ta2O5 into ZnO brought about the highest response toward H2, when compared with other examined Zn-Ta-based oxide SE materials. After a stabilization period of about 50 days, the sensor exhibited a stable and high sensitivity (Δemf) of approximately -600 mV toward 100 ppm H2 and low cross-sensitivity towards other examined gases (< ± 80 mV) at 500 o C under humid operating conditions (20 vol.% O2 and 5 vol.% H2O). An almost linear relationship between sensitivity and H2 concentration (10-100 ppm) was observed for the developed sensor.
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