应用两电极直流极化法测定了氧传感器在380～800℃中的Pt，空气／YSZ电极电阻，从交流低频阻抗测量外推法测得YSZ的体电阻，可以将YSZ的直流极化从电极的过电位中区分出来．Pt，空气｜（ZrO2）0．93（Y2O3）0．07｜空气，Pt，电池的直流极化1gI-η作图得出，电极电荷传递系数为2．YSZ体电阻、Pt，空气／YSZ电极电阻和电极交换电流对温度的Arrhenius图，在600℃和570℃附近存在着类似的活化能变化．测量表明；700℃时，氧传感器的测量响应时间≤2．5s．
The Pt, air/YSZ electrode resistance was determined for oxygen sensor with dc polarization of two electrode in the temperature range of 380～800℃.
The (ZrO2)0.93(Y2O3)0.07 bulk resistances were obtained from the extrapolation method by ac low frequency impedance measurement, and the electrolyte
dc polarization resistance can be separated from electrode overpotentials. Results show the η-I curves obey the Butler-Volmer equation, with charge transfer
coefficients of two for the Pt, air |YSZ| air, Pt cell. The temperature dependence of the YSZ bulk resistance and the Pt, air/YSZ electrode resistance is
similar and a change in the activation energy of resistance occurs near 600℃ and 570℃ respectively. The exchange current I0 of electrode as a
funclion of temperature was also measured. At temperature above 700℃, response time of the oxygen sensor is less than 2.5s.
参考文献
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| [2] | Filal M, et al. Solid State Ionics. 1995, 80: 27--35 2 Suzuki Y. Solid State Ionics, 1995, 81: 211--216 |
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