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研究了甲酸在二十四面体Pt纳米晶(THHPtNCs)电极表面解离吸附反应过程.电化学原位红外反射光谱结果显示,甲酸在低电位(-0.20V(SCE))即可在THHPtNCs电极上氧化到CO2,同时发生分子内化学键断裂生成吸附态CO物种.运用程序电位阶跃暂态方法定量研究甲酸解离吸附反应动力学,测得5×10-3mol·L-1 HCOOH+0.1mol·L-1 H2SO4溶液中甲酸在THHPtNCs电极上解离吸附的最大平均速率υamax为13.19×10-10mol·cm-2·s-1,是商品Pt/C催化剂电极上υamax的1.5倍.研究结果揭示了THHPtNCs的反应活性显著高于Pt/C催化剂.
The dissociative adsorption process of formic acid on the surface of tetrahedron Pt nanocrystals (THHPtNCs) was studied.The results of electrochemical in situ infrared reflectance spectroscopy showed that formic acid could be adsorbed on THHPtNCs electrode at low potential (-0.20V (SCE) On the oxidation to CO2, while intramolecular chemical bond rupture generated adsorbed CO species.Using the program potential step transient method to quantitatively study formic acid dissociative adsorption kinetics, measured 5 × 10-3mol·L-1 HCOOH + 0.1mol · The maximum average rate of dissociative adsorption of formic acid on THHPtNCs electrode in L-1 H2SO4 solution was 13.19 × 10-10 mol · cm-2 · s-1, which is 1.5 times of that of commercial Pt / C catalyst electrode. It was revealed that the reactivity of THHPtNCs was significantly higher than that of Pt / C catalyst.