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运用电化学循环伏安法和石英晶体微天平研究了正丙醇在Pt电极和以Sb、S吸附原子修饰的Pt(Pt/Sbad和Pt/Sad)电极上的吸附和氧化过程.从电极表面质量变化角度指出正丙醇的氧化与电极表面氧物种有着极其密切的关系.Pt电极表面Sb吸附原子能在较低的电位下吸附氧,可显著提高正丙醇电催化氧化活性,与在Pt电极上相比较,正丙醇氧化的峰电位负移了0.29V,峰电流增加了近2倍.相反,Pt电极表面S吸附原子的氧化会消耗表面氧物种,饱和吸附S原子的Pt电极上正丙醇的电氧化受到抑制.本文从表面质量变化提供了吸附原子电催化作用的新数据.
The adsorption and oxidation of n-propanol on Pt electrode and Pt (Pt / Sbad and Pt / Sad) electrode modified by Sb and S adsorption atoms were studied by electrochemical cyclic voltammetry and quartz crystal microbalance. The mass change point indicates that the oxidation of n-propanol is closely related to the oxygen species on the surface of the electrode.The Sb atoms adsorbed on the Pt electrode surface can adsorb oxygen at a lower potential, which can significantly improve the electrocatalytic oxidation activity of n-propanol, , The peak potential of n-propanol oxidized negatively by 0.29V and the peak current increased nearly by 2. On the contrary, the oxidation of S adsorbed atoms on the surface of Pt electrode consumed the surface oxygen species, and the Pt electrode saturated with S atom adsorbed The electrooxidation of propanol is inhibited.This paper provides new data on the electrocatalysis of adsorbed atoms from the change of surface quality.