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首页> 外文会议>Fifth International Manuel M.Baizer Symposium in Honor of Professor Jean Michel Saveant at the 201st Meeting of the Electrochemical Society Centennial Meeting May 12-17, 2002 Philadelphia, PA, USA >TOWARDS MOLECULAR-LEVEL UNDERSTANDING OF ELECTROCATALYTIC HYDROGENATION. PART 1. BEHAVIOR OF BENZENE AT Pt(111)
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TOWARDS MOLECULAR-LEVEL UNDERSTANDING OF ELECTROCATALYTIC HYDROGENATION. PART 1. BEHAVIOR OF BENZENE AT Pt(111)

机译：迈向电加氢的分子水平认识。第1部分。苯在Pt（111）的行为

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摘要

We contribute to the molecular-level comprehension of the electrocatalytic hydrogenation. We present new results on the behavior of benzene at Pt(111) in aq. H_2SO_4 in the potential region corresponding to the H_(UPD) adsorption. We analyze the modifications of cyclic-voltammetry (CV) profiles caused by benzene adsorption on Pt(111) and examine the evolution of the benzene, hydrogen and anion surface coverage arising upon the potential scanning between 0.05 and 0.80 V. The data illustrate that as long as the H_2SO_4 electrolyte is saturated with benzene, its surface coverage remains constant. As Pt(111) is transferred to a benzene-free electrolyte, the CV profile returns to the original form characteristic of a clean, well-defined Pt(111). We analyze the cathodic and anodic charge densities as a function of the number of potential transients and discuss the changes in the CV profiles in terms of H_(UPD) adsorption in the presence of benzene and the desorption of the latter from the Pt(111) surface.
机译：我们为电催化氢化的分子水平理解做出了贡献。我们提出了苯在Pt（111）水溶液中的行为的新结果。对应于H_（UPD）吸附的电势区域中的H_2SO_4。我们分析了由苯吸附在Pt（111）上引起的循环伏安（CV）曲线的修改，并研究了在0.05至0.80 V之间的电势扫描引起的苯，氢和阴离子表面覆盖范围的演变。数据表明，只要H_2SO_4电解质被苯饱和，其表面覆盖率就保持恒定。当Pt（111）转移到无苯电解液中时，CV曲线恢复为清晰，轮廓分明的Pt（111）的原始形状特征。我们分析了作为潜在瞬态数量的函数的阴极和阳极电荷密度，并讨论了在苯存在下H_（UPD）吸附以及后者从Pt解吸方面CV曲线的变化。表面。

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