Gold-composite electrodes for hydrocarbon sensors based on YSZ solid electrolyte |
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Authors: | D Westphal S Jakobs U Guth |
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Institution: | (1) Sensor Research Center Greifswald, Germany;(2) Institute for Chemistry and Biochemistry, University of Greifswald, Germany;(3) Kurt-Schwabe-Institut Meinsberg, Dresden University of Technology, Germany;(4) Forschungszentrum Sensorik Greifswald, Brandteichstr. 19, D-17489 Greifswald, Germany |
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Abstract: | In potentiometric zirconia based sensors gold electrodes show a high sensitivity for hydrocarbons (HC's) when the measurements
are carried out in non equilibrated oxygen containing gas mixtures at temperatures <700 °C. This behaviour explained by mixed
potential theory is not stable and depends strongly on preparation and particularly on measuring conditions. To modify the
electrode behaviour composites consisting of gold and gallium oxide were investigated. Gold pastes with different amount of
Ga2O3 were prepared and screen printed on YSZ pellets. After sintering at defined temperatures between 900 and 950 °C the cells
were tested regarding the electrode behaviour in a C3H6, O2 gas mixture using a platinum air reference electrode. These composite electrodes show as compared with pure gold an enhanced
sensitivity at low propylene concentrations and a time-independent characteristic at high concentrations of C3H6. The optimal composition is found to be at 20 mass-% Ga2O3. This electrode can be treated in reducing gases at temperatures 850 °C without changing its characteristics.
Paper presented at the 7th Euroconference on Ionics, Calcatoggio, Corsica, France, Oct. 1–7, 2000. |
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