Abstract
A solid state electrochemical cell using the K+ ionic conductor, K2O-Sm2O3-6SiO2, as a solid electrolyte was investigated for monitoring carbon dioxide in air. At temperatures of 300 to 500°C, the electromotive force, EMF, of the sensor increased linearly with an increase in the logarithm of carbon dioxide partial pressure, in accordance with the Nernst's law. The slope of the Nernst's equation suggests two electrons reaction of carbon dioxide molecules at the detection electrode. The 90% response time of EMF of the sensor at 500°C was about 4min. The long-term stability of EMF of the sensor was essentially good after the 10th day.
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