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应用电位扫描和电位-时间程序技术研究了在UPD铅不存在和存在的情况下,各种因素对甲酸在铂上和酸介质中电催化氧化的影响。结果表明,在甲酸的CV图上,阳极方向的第一氧化峰和阴极方向的氧化峰是由于同一的弱吸附中间物的氧化,而阳极方向的第二和第三氧化峰是由于两种不同的强吸附中间物的氧化。cps值的测定和电极表面宏观结构的影响等实验表明,这些吸附中间物在电极表面上都呈线性吸附,它们分别可能是单键吸附的HCOO_(ad)双键吸附的CO_(ad)和叁键吸附的COH_(ad)。据此可以推论,UPD铅的主要功用是一种电子效应。
The effects of various factors on the electrocatalytic oxidation of formic acid on platinum and acid media were investigated using potential sweep and potential-time programming techniques in the absence and presence of UPD. The results showed that the first oxidation peak in the anode direction and the cathode oxidation peak in the formic acid CV diagram are due to the oxidation of the same weakly adsorbed intermediate while the second and third oxidation peaks in the anode direction are due to two different The strong adsorption of intermediate oxidation. The experimental results of the determination of cps value and the influence of macrostructures on the electrode surface show that these adsorptive intermediates are linearly adsorbed on the surface of the electrode. They may be CO_ (ad) and three (3) adsorbed on HCOO_ (ad) Bond adsorbed COH_ (ad). From this we can deduce that the main function of UPD lead is an electronic effect.