The mixed potential type gas sensor based on stabilized zirconia and molybdate MMoO4 (M: Ni, Co and Zn) sensing electrode aiming at detecting triethylamine

The mixed potential type gas sensors utilizing yttria stabilized zirconia (YSZ) solid electrolyte and molybdates MMoO4 (M: Ni, Co and Zn) sensing electrodes (SEs) were fabricated aiming at detecting triethylamine (TEA) at 600 C. Results indicated that the device attached with NiMoO4-SE exhibited the highest response value of -71 mV to 50 ppm TEA and low detection limit of 100 ppb at 600 degrees C. Moreover, the response time of the developed sensor to 50 ppm TEA was 3 s, which signified the fast response rate. The response value of fabricated sensor displayed the piecewise linear relationship to logarithm of TEA concentrations and the sensitivities were -4 mV/decade (0.1-1 ppm) and -37 mV/decade (1-100 ppm), respectively. More importantly, the present sensor also exhibited good repeatability, selectivity, slight effect of humidity and stability of 10 days, indicating a great candidate for use in detection of TEA. Furthermore, the device based on mixed potential mechanism was proposed and further verified using polarization curve. (C) 2018 Elsevier B.V. All rights reserved.