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在300℃和400℃下,对掺铂和不掺铂催化剂的多孔氧化锌陶瓷的电阻率变化和还原气体的化学变化进行测量,以验证其气敏机理和掺铂的影响。还原气体在传感器表面被氧化成CO_2和H_2O。掺铂可促进还原气体的氧化但不会导致400℃时电阻率变化的增大。考虑到碳氢化合物的分部氧化的中间产物,提出了气敏过程的反应程序。在铂上的氧化没有电子迁移过程。
The resistivity of the porous zinc oxide ceramics doped with or without platinum and the chemical changes of the reducing gas were measured at 300 ℃ and 400 ℃ to verify the gas sensing mechanism and the effect of platinum doping. The reducing gas is oxidized to CO_2 and H_2O on the sensor surface. Platinum doping promotes the oxidation of the reducing gas but does not result in an increase in resistivity at 400 ° C. Taking into account the partial oxidation of hydrocarbons intermediate product, the reaction process of gas-sensitive process is proposed. Oxidation on platinum has no electron transfer process.