Abstract
This work focuses on the H2 sensing performance of the sensor with buried Au sensing electrode and spineltype oxide CoCrMnO4 insensitive reference electrode within sodium super ionic conductor(NASICON) film. The sensor showed the highest response to H2 gas on the insensitive material sintering at 800 °C. Compared with those of the traditional structure device, the sensitivity and selectivity of the sensor using buried sensing electrode were greatly improved, giving a response of −177 mV in 9×10−5 g/L H2, which was about 3.5 times higher than that of sensors with traditional structure. Moreover, the ΔV value of the sensing device exhibited linear relationship to the logarithm of H2 concentration and the sensitivity(slope) was −135 mV/decade. A sensing mechanism related to the mixed potential was proposed for the present sensor.
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