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分别测定了Pt电极有0.1mol/1 NaF和0.1mol/1 NaF+0.01mol/1吡啶溶液中的反射差谱和相对反射率变化-电位图,发现在阳极极化电位区,反射差谱出现550nm的新谱带,它可指认为平卧取向的吡啶吸附分子和Pt电极表面所生成的电荷转移复合物在光激发下产生的电荷转移吸收谱带,自氧在Pt电极上吸附到电极表面生成表面相氧化物之前的电位范围内,表面Pt原子氧化态的变化基本上不影响金属Pt的悬空键能级,当表面相氧化物生成后,新谱带消失,吡啶分子可能脱附。
The difference of reflectance spectra and relative reflectance between Pt electrode and 0.1mol / L NaF and 0.1mol / L NaF + 0.01mol / L pyridine solution were measured respectively. It was found that in the anodic polarization potential region, the reflection difference spectrum appeared 550nm of the new band, which can be identified as the horizontal adsorption of pyridine molecules and Pt electrode surface generated charge-transfer complex generated under the excitation of the charge-transfer absorption band, adsorption of oxygen from the Pt electrode to the electrode surface The change of the oxidation state of the Pt atom on the surface does not affect the dangling bond level of the metal Pt within the potential range before the formation of the surface phase oxide. When the surface phase oxide is formed, the new band disappears and the pyridine molecule may desorb.