Abstract
The sensitivity of the electrical conductivity of platinized semiconducting oxides at room temperature to the surface state of supported Pt is demonstrated. Materials that exhibited only Pt0 species, despite catalyzing CO oxidation at room temperature, showed no CO sensitivity of the electrical conductivity at room temperature. Moisture in air caused oxidation of finely dispersed Pt0 to PtII. The resultant materials did not catalyze CO oxidation at room temperature but did show a room-temperature response of electrical conductivity to CO. These materials did not have a large effect of water vapor on the electrical conductivity; however materials that had been further oxidized, to develop Pt(IV) states on the surface, not only showed a room-temperature response of electrical conductivity to CO, but also showed a large effect of water vapor on the conductivity. We propose the following: surface Pt(II) and Pt(IV) act as band-gap trap states for electrons from the support, significantly decreasing the measur...
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