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Electrochemical Gas Sensor Materials Studied by Impedance Spectroscopy Part II: Reference Electrode and Solid Electrolyte/Electrode System |
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| Authors: | P Pasierb S Komornicki R Gajerski S Koziński P Tomczyk M Rękas |
| Affiliation: | (1) Faculty of Materials Science and Ceramics, University of Mining and Metallurgy, 30-059 Cracow, Poland;(2) Faculty of Fuels and Energy, University of Mining and Metallurgy, 30-059 Cracow, Poland;(3) School of Materials Science and Engineering, The University of New South Wales, UNSW, Sydney, NSW, 2052, Australia |
| Abstract: | The behavior of the reference electrode (Na2Ti6O13--TiO2) and the electrode/solid electrolyte (Nasicon) interface of the electrochemical sensor were investigated by means of complex impedance spectra in the frequency range 0.1 Hz–1 MHz and at the temperatures between 298 K and 873 K. A plausible equivalent circuit involving two R-CPE elements connected in series was proposed. The results were discussed in terms of the brick-layer model. The parameters characterizing Schottky barrier occurring at the grain boundary interface were determined. |
| Keywords: | impedance spectroscopy electrochemical gas sensors solid electrolytes Nasicon |
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