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用电导和红外光谱法研究了 Pt/TiO_2体系的金属-半导体载体的相互作用。随着氢预处理温度的升高,Pt/TiO_2体系的电导逐渐增加,CO吸附态的红外谱带强度变弱和逐渐“红移”,表明活化的氢驱动了TiO_2与金属Pt之间的电子传递。还发现CO吸收主峰红移后,又随平衡时间的延长而“紫移’,电导值也相应地下降,这是由于Pt/TiO_2体相的质子 H~+反溢流至Pt/TiO_2表面与吸附态的CO发生作用的结果。讨论了在氢参与下金属 Pt与半导体TiO_2之间相互作用的动态变化过程。
The interaction of metal-semiconductor carriers in Pt / TiO 2 system was studied by conductivity and infrared spectroscopy. With the increase of hydrogen pretreatment temperature, the conductance of Pt / TiO_2 system increased gradually, the intensity of the infrared band of CO adsorbed state became weaker and gradually “red shifted”, indicating that the activated hydrogen drives the electron between TiO_2 and metal Pt transfer. It was also found that after the main peak of CO absorption shifted to red, the “violet shift” with the extension of equilibrium time also led to a corresponding decrease in conductance due to the proton H + antiport over Pt / TiO 2 phase to Pt / TiO 2 surface As a result of adsorbed CO, the dynamic process of the interaction between metal Pt and semiconductor TiO_2 with hydrogen is discussed.