Deterioration phenomena of electrochemical CO2 sensor with Pt, Na2CO3/ Na2O-Al2O3-4SiO2//YSZ/Pt structure
| Autor: | Youichi Shimamoto, Hiromichi Aono, Takashi Okamoto, Yoshihiko Sadaoka, Laura Montanaro |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Auxiliary electrode
Electromotive force Chemistry Diffusion Inorganic chemistry Metals and Alloys Condensed Matter Physics Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Carbon dioxide sensor Materials Chemistry Reactivity (chemistry) Electrical and Electronic Engineering Instrumentation Layer (electronics) Yttria-stabilized zirconia |
| Popis: | CO 2 sensing characteristics were examined in dry condition for Pt, Na 2 CO 3 /Na 2 O–Al 2 O 3 –4SiO 2 //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 Na 2 CO 3 layer with morphological changes. The diffusion of Na ion in Na 2 O–Al 2 O 3 –4SiO 2 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 Na 2 CO 3 with SiO 2 in Na 2 O–Al 2 O 3 –4SiO 2 layer. Furthermore, it is confirmed that the reactivity of Na 2 CO 3 with SiO 2 is strongly affected by the preparation method/route of Na 2 CO 3 layer as an auxiliary electrode. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|