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在300℃和400℃时,测量了带有和未带有铂催化剂的多孔ZnO陶瓷电阻率的变化及还原气体的化学变化,以便检验气体传感机理和铂添加物的影响。还原气体在传感器的表面上被氧化成CO_2和H_2O。铂添加物促进了还原气体的氧化,但是在400℃时没有导致电阻率变化的增大。 在考虑到部分氧化的碳氢化合物中间物以及铂上的氧化没有电子迁移的情况下,提出了气体传感过程的反应程序。
The changes of the resistivity of the porous ZnO ceramics with and without the platinum catalyst and the chemical changes of the reducing gas were measured at 300 ° C and 400 ° C in order to examine the effects of the gas sensing mechanism and the platinum addition. The reducing gas is oxidized to CO 2 and H 2 O on the surface of the sensor. The platinum additive promoted the oxidation of the reducing gas, but did not result in an increase in resistivity at 400 ° C. The reaction procedure of the gas sensing process is proposed considering that the partially oxidized hydrocarbon intermediate and the oxidation on platinum have no electron transfer.