Performance and stability of potentiometric CO₂ gas sensor based on the Pt, Li₂CO₃/Na₂O–Al₂O₃–4SiO₂//YSZ/Pt ele

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• 作者：Shimamoto ; Youichi ; Okamoto ; Takashi ; Itagaki ; Yoshiteru ; Aono ; Hiromichi ; Sadaoka ; Yoshihiko
• 关键词：Sodium-aluminosilicates ; Lithium silicates ; Y-stabilized zirconia ; Li₂CO₃ ; Electromotive force ; CO₂ gas sensor
• 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：113-117
• 文件大小：147 K

摘要

CO₂ sensing characteristics were examined in dry condition for Pt, Li₂CO₃/Na₂O–Al₂O₃–4SiO₂ (NA4S)/YSZ/Pt structure. The electromotive force (emf) value was linearly increased with logarithm of CO₂ concentration in the range of 10–10,000ppm and the electron number was closed to 2.0. The electron number was hardly changed and the activity of alkali metal oxide in NA4S increased with time. As a reason to increase in the activity, the reaction of Li₂CO₃ as an auxiliary electrode with SiO₂ in NA4S layer and the formation of lithium silicates are considered. The formation of Li₂SiO₃ was accelerated by using H₂O, methanol or ethanol instead of α-terpineol as an additive for the mixing of Li₂CO₃ and silica. It was concluded that to depress the reaction with Li₂CO₃ and silica, the use of Li₂CO₃ mixed with α-terpineol for an auxiliary electrode was preferable.