CO sensing characteristics of YSZ-based planar sensor using Rh-sensing electrode composed of tetrahedral sub-micron particles

Abstract The nano-structured noble metal sensing electrodes (SEs) were fabricated on a tape-casted yttria-stabilized zirconia (YSZ) substrate by applying the colloidal solution of each of Au, Rh, Ru and Ir, followed by annealing at high temperature. The obtained SEs were studied in YSZ-based planar sensors with respect to a Pt reference-electrode (RE), aimed at obtaining high selectivity and sensitivity to various hazardous gases. As a result, the sensor using 1100 °C-sintered Rh-SE was found to exhibit high CO sensitivity and rather good CO selectivity even at the operating temperature of 700 °C and under highly humid condition (5 vol.% water vapor). SEM observation revealed that Rh-SE was mainly composed of tetrahedral sub-micron particles distributed homogeneously along YSZ substrate. The fabricated sensor was capable of providing stable and repeatable response to each CO concentration in the range of 30–400 ppm and the CO sensitivity varied linearly on the logarithm of gas concentration.

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