Room temperature response of SnO2-electrode modified solid state electrochemical CO2 sensors |
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Authors: | E Steudel P Birke W Weppner |
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Institution: | (1) Chair for Sensors and Solid State Ionics, Christian-Albrechts University, Kaiserstrasse 2, D-24143 Kiel, Germany |
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Abstract: | A thin film solid state electrochemical gas sensor has been investigated for CO2 detection based on the cell reaction: Na++OH+CO2=NaHCO3. The galvanic cell arrangement is Au | NaxCoO2−δ (ref.) | NASICON | Au, SnO2 where the right hand electrode is in contact with CO2 and O2 in a humid atmosphere. The response has been compared to results obtained with a conventional pellet type sensor. Furthermore,
both devices have been exposed to CO and humidity. Strong cross-sensitivities were observed leading to large changes in the
emf in both cases. The response to moisture is reversible and fast with a response time of about 1 min according to a fast
surface reaction of H2O with SnO2. The presence of CO leads to a signal change with a high response time and a very slow reverse reaction. However, the response
to CO2 is not influenced by the presence of CO or H2O with regard to the signal height and response time.
Paper presented at the 3rd Euroconference on Solid State Ionics, Teulada, Sardinia, Italy, Sept. 15–22, 1996 |
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