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Deterioration phenomena of electrochemical CO2 sensor with Pt, Na2CO3/Na2O-Al2O3- 4SiO2//YSZ/Pt structure

CO2 sensing characteristics were examined in dry condition for Pt, Na2CO3/Na2O-Al2O 3-4SiO2//YSZ/Pt structure. After settled at the working temperature at 460°C, emf was gradually decreased with time and then increased. The drift to decrease the emf observed in the initial period is due to the remove of water in Na2CO3 layer with morphological changes. The diffusion of Na ion in Na2O-Al2O 3-4SiO2 layer to YSZ layer is also one of the reason. The increase in the emf observed in the following period is due to the increase in the activity by the reaction of Na2CO3 with SiO 2 in Na2O-Al2O3-4SiO2 layer. Furthermore, it is confirmed that the reactivity of Na2CO 3 with SiO2 is strongly affected by the preparation method/route of Na2CO3 layer as an auxiliary electrode.
Year: 
DOI: 
10.1016/j.snb.2003.11.009
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