Abstract
Solid electrochemical sensors based on sodium super ionic conductor (NASICON) and spinel-type oxide CoCr2−x MnxO4 (x = 0, 1, 1.2, 1.4 and 2) sensing electrode were designed for sub-ppm H2S detection. In comparison with other spinel-type oxides, the sensor using CoCr1.2Mn0.8O4 showed the maximum response of 178 mV for 10 ppm H2S at 250 °C. The sensor displayed good stability for H2S during the testing period. Moreover, the sensor exhibited excellent selectivity toward H2S against the other interference gases, such as SO2, NO2, CH4, CO, C2H4, H2 and NH3. A sensing mechanism related to the mixed potential was proposed for the sensor based on NASICON and oxide electrodes. The effect of sintering temperature had also been investigated.
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