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首页> 外文期刊>Electrocatalysis >Layer-by-Layer Deposition of Pd on Pt(111) Electrode: an Electron Spectroscopy-Electrochemistry Study
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Layer-by-Layer Deposition of Pd on Pt(111) Electrode: an Electron Spectroscopy-Electrochemistry Study

机译：Pt（111）电极上Pd的逐层沉积：电子光谱-电化学研究

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摘要

Ultrathin palladium films, at coverages that ranged from one half to eight monolayers, were prepared, one layer at a time, on a well-defined Pt(111) single-crystal electrode surface by surface-limited redox replacement reaction (galvanic exchange) of Cu initially coated via underpotential deposition. Adlayers produced by the galvanic-exchange method were completely free of any residual Cu after the displacement-by-Pd step. Analysis of the current-potential profiles in the hydrogen-adsorption region indicated that at one monolayer coverage, the film was essentially pure terrace, devoid of steps, which did not exhibit hydrogen absorption. At higher coverages, a Stranski-Krastanov growth mode was manifested by the emergence of a voltammetric peak characteristic of hydrogen adsorption-desorption at step sites. Peaks diagnostic of hydrogen adsorption on both terrace and steps persisted even at a Pd-film thickness of eight inonolayers; the intensities were considerably diminished, however, which indicated that hydrogen absorption into the now-bulk-like film had become dominant.
机译：通过表面有限的氧化还原置换反应（电流交换），在界限分明的Pt（111）单晶电极表面上一次制备一层超薄钯膜，覆盖范围从一半到八个单层。最初通过欠电势沉积涂覆Cu。通过电流交换法生产的夹层在逐Pd置换步骤后完全不含任何残留的Cu。对氢吸附区域中电流势分布的分析表明，在一层单层覆盖下，该膜基本上是纯净的台阶，没有台阶，并且不表现出氢吸收。在更高的覆盖率下，Stranski-Krastanov的生长模式通过在阶跃位置出现的氢吸附-解吸伏安峰表征。即使在8个非离子层的Pd膜厚度下，仍然可以诊断台阶和台阶上氢吸附的峰值。强度显着降低，但是，这表明氢已吸收到现在的大块状薄膜中。

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