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

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• 作者：Shimamoto ; Youichi ; Okamoto ; Takashi ; Aono ; Hiromichi ; Montanaro ; Laura ; Sadaoka ; Yoshihiko
• 关键词：Sodium-aluminosilicates ; Y-stabilised zirconia ; Na₂CO₃ ; CO₂ gas sensor ; Electromotive force
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2004
• 期刊代码：161_09254005
• 类别：et
• 出版时间：April 15, 2004
• 卷：99
• 期：1
• 页码：141-148
• 文件大小：466 K

摘要

CO₂ sensing characteristics were examined in dry condition for Pt, Na₂CO₃/Na₂O–Al₂O₃–4SiO₂//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–Al₂O₃–4SiO₂ 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 SiO₂ in Na₂O–Al₂O₃–4SiO₂ layer. Furthermore, it is confirmed that the reactivity of Na₂CO₃ with SiO₂ is strongly affected by the preparation method/route of Na₂CO₃ layer as an auxiliary electrode.