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首页> 外文期刊>Journal of Crystal Growth >Electrochemical adsorption of cyanide on Ag(111) in the presence of cetylpyridinium chloride
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Electrochemical adsorption of cyanide on Ag(111) in the presence of cetylpyridinium chloride

机译：氯化十六烷基吡啶存在下氰化物在Ag（111）上的电化学吸附

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摘要

The behaviour of an Ag(111) electrode in contact with a neutral perchlorate solution containing cetylpyridinium chloride (CPC) and potassium cyanide was studied as a function of potential. The understanding of the interaction of organic additives relevant to metal plating processes with specific crystal faces can provide guidelines for the design of advanced and environmentally friendly electrodeposition processes. CPC acts as a cathodic depolariser and an efficient hydrogen scavenger in precious metal and alloy electrodeposition baths containing cyanocomplexes.In situ spectroelectrochemical FT-IR measurements were carried out using both p- and s-polarised radiation. FT-IR data were complemented by SERS measurements on electrochemically roughened polycrystalline Ag in order to clarify the potential-dependent orientational behaviour of CPC. Cyclic voltammetry and differential capacitance measurements were employed to asses the electroactivity and adsorption ability of the relevant species.The results obtained evidenced a reorientation of the heteroaromatic ring from flat to vertical on shifting the electrode potential from anodic to cathodic. Surface CN- stretching bands were observed with and without CPC in the solution. As a function of potential, the presence of CPC shifts the CN- peak position to higher wavenumbers, suggesting the existence of an interaction between adsorbates, and increases in the peak intensities, possibly denoting coadsorption on interacting adsorption sites. (C) 2004 Elsevier B.V. All rights reserved.
机译：研究了Ag（111）电极与含有十六烷基氯化吡啶鎓（CPC）和氰化钾的中性高氯酸盐溶液接触的行为与电位的关系。对与金属电镀工艺相关的有机添加剂与特定晶面的相互作用的理解可以为设计先进且环保的电沉积工艺提供指导。 CPC在含有氰基配合物的贵金属和合金电沉积浴中充当阴极去极化剂和有效的氢清除剂。使用p极化和s极化辐射进行原位光谱电化学FT-IR测量。 FT-IR数据通过电化学粗糙化多晶Ag的SERS测量得到补充，以阐明CPC的电势依赖性取向行为。通过循环伏安法和差动电容测量来评估相关物质的电活性和吸附能力。所得结果证明，当电极电位从阳极转移到阴极时，杂芳环从平面变为垂直。在溶液中有或没有CPC的情况下都观察到了表面CN拉伸带。作为电位的函数，CPC的存在将CN-峰位置移至更高的波数，表明被吸附物之间存在相互作用，并且峰强度增加，这可能表示相互作用的吸附位点上的共吸附。 （C）2004 Elsevier B.V.保留所有权利。

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