Long-term stability of potentiometric CO2 sensors based on Nasicon as a solid electrolyte
| Autor: | S. Komornicki, Mieczyslaw Rekas, R. Gajerski, Paweł Pasierb, S. Koziński |
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| Rok vydání: | 2004 |
| Předmět: |
Chemistry
Inorganic chemistry Potentiometric titration Metals and Alloys Analytical chemistry Electrolyte Condensed Matter Physics Reference electrode Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrochemical gas sensor Operating temperature Electrode Materials Chemistry Fast ion conductor Potentiometric sensor Electrical and Electronic Engineering Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 101:47-56 |
| ISSN: | 0925-4005 |
| Popis: | Five solid-state potentiometric CO 2 sensors of the type: CO 2 , O 2 , Ag, M 2 CO 3 –BaCO 3 |Nasicon| X, Pt, O 2 (where M=Li or Na, X—Na 2 O activity buffer) were investigated. The effects of electrode composition and operating temperature on long-term performance of sensors were determined. It was found that the sensors with Na 2 Ti 6 O 13 /Na 2 Ti 3 O 7 reference electrode show stable signal during 1000 h. No effect of the sensing electrode composition was observed. The optimal operating temperature of the studied sensors was 748 K. The formation of liquid phase at this temperature at the sensing electrode/solid electrolyte interface is suspected to be responsible for improvement of the sensors performance. The reactivity between sensing electrode and solid electrolyte materials at higher temperatures leads to sensors instability. |
| Databáze: | OpenAIRE |
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