A YSZ oxygen sensor responded correctly to changes in oxygen concentration in an autoclave chamber,although at elevated pressures, the electron transfer numbers agreed well with the theoretical value of 4.The electrochemical impedance spectra (EIS) of the sensor at an oxygen concentration of 500000 ppm,a temperature of 873 K and pressures of 1-80 atm were determined, and those results demonstrated thatthe overall electrode resistances were strongly dependent on the pressure of the system, which wasprobably due to the change of physical and chemical characteristics of the working medium. This resultis consistent with the strong impact of pressure on the response rate of the oxygen sensor working in awater content atmosphere at elevated pressures.
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