Abstract
The results of studies of oxide electrodes for solid electrolyte potentiometric sensors for analyzing air-combustible gas (combustible gas is CO or H2) and nitrogen-combustible gas mixtures are presented. The characteristics of the electrochemical cells based on Zr0.82Y0.18O1.9 and Ce0.8(Sm0.8Ca0.2)0.2O2-δ solid electrolytes were considered. The dependences of the response of the potential of the measuring electrodes of simple oxides SnO2 and ZnO and complex oxides with a perovskite structure La0.8Sr0.2CrO3 and La0.6Sr0.4MnO3 on the concentration of carbon monoxide and hydrogen in air were studied. The most promising application was found to be hydrogen determination in the air-hydrogen mixture for sensors with a SnO2 measuring electrode with a zirconia electrolyte and CO analysis in the air-carbon monoxide mixture for sensors with a ZnO measuring electrode. The measuring electrodes and SnO2, La0.8Sr0.2CrO3, ZnO, and La0.6Sr0.4MnO3 on ceria and zirconia electrolytes showed satisfactory sensitivity to hydrogen in the hydrogen-nitrogen gas mixture at hydrogen concentrations of up to 100 ppm and at temperatures of 500–550°C.
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Original Russian Text © A.S. Kalyakin, G.I. Fadeev, A.N. Volkov, E.V. Gorbova, A.K. Demin, 2015, published in Elektrokhimiya, 2015, Vol. 51, No. 2, pp. 162–170.
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Kalyakin, A.S., Fadeev, G.I., Volkov, A.N. et al. Electrodes for potentiometric solid-electrolyte sensors with nonseparated gas spaces for measuring the contents of combustible CO and H2 gases in gas mixtures. Russ J Electrochem 51, 134–141 (2015). https://doi.org/10.1134/S1023193515020068
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DOI: https://doi.org/10.1134/S1023193515020068