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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Adsorption of Formate on Au(111) in Acid Solution: Relevance for Electro-Oxidation of Formic Acid
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Adsorption of Formate on Au(111) in Acid Solution: Relevance for Electro-Oxidation of Formic Acid

机译：甲酸溶液中Au（111）上甲酸酯的吸附：与甲酸电氧化有关

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摘要

The behavior of formic acid on Au(111) in perchloric acid solution at room temperature has been investigated by electrochemical methods and in situ scanning tunneling microscopy (STM) in the potential region negative to surface oxidation. Specific adsorption of formate lifts the reconstruction of the Au(111) surface. Currents for formate adsorption have been separated from those of formic acid oxidation by varying the sweep rate between 0.01 and 50 V s(-1). A 2D phase transition within the formate layer adsorbed on long-range Au(111) terraces gives rise to a characteristic voltammetric needle-peak. Parallel chains of strongly bound formate have been imaged by in situ STM. Steady-state voltammetry at different formic acid concentrations shows a characteristic bell-shaped current maximum and a pronounced current jump related with the adlayer phase transition at more positive potentials. Oxidation kinetics of formic acid strongly depends on formate adsorption, which is determined by the electrode potential, the pH, and the formic acid concentration. Various adsorbates (bidentate and monodentate formate and/or carboxylate) with entirely different reactivity are supposed to play a role in the formic acid oxidation mechanism.
机译：通过电化学方法和原位扫描隧道显微镜（STM）研究了在室温下甲酸在高氯酸溶液中Au（111）上的行为，该作用在对表面氧化不利的潜在区域中。甲酸盐的特定吸附可提升Au（111）表面的重建。通过在0.01至50 V s（-1）之间改变扫描速率，甲酸吸附电流已与甲酸氧化电流分离。吸附在远距离Au（111）台阶上的甲酸盐层内的2D相变产生了特征伏安针峰。原位STM已对强结合甲酸酯的平行链进行了成像。在不同甲酸浓度下的稳态伏安法显示出特征性的钟形电流最大值，并且在更正的电势下与吸附层相变有关的明显电流跃变。甲酸的氧化动力学很大程度上取决于甲酸的吸附，甲酸的吸附由电极电位，pH和甲酸浓度决定。具有完全不同反应性的各种被吸附物（二齿和单齿甲酸盐和/或羧酸盐）被认为在甲酸的氧化机理中起作用。

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