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Electrochemical Characterization of 2D Pt Nanoislands

机译：二维Pt纳米岛的电化学表征

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摘要

Pt nanoparticles with bi-dimensional geometry and circular shape have been synthesized and studied by in situ Fourier transform infrared spectroscopy, scanning tunneling microscopy, CO stripping voltammetry, cyclic voltammetry, and methanol oxidation in acidic and alkaline media. The experimental results suggest that Pt nanodiscs present a bi-dimensional (111) order domain on the surface and a high density of step edge sites mainly with (110) and (100) orientations. A clear correlation between the atomic surface arrangement and the catalytic activity towards the CO and methanol oxidation, as well as the voltammetric profiles in the electrolyte, was observed. Additionally, infrared spectra proved the high density of low-coordinated Pt atoms present in the nanoparticle and that CO adsorbed in linear configuration is the main adsorbate. The electrochemical study was compared with that of spherical Pt particles supported on carbon (Pt/C 20 wt.%, Etek).
机译：通过原位傅立叶变换红外光谱，扫描隧道显微镜，CO溶出伏安法，循环伏安法以及在酸性和碱性介质中的甲醇氧化，合成并研究了具有二维几何形状和圆形形状的Pt纳米颗粒。实验结果表明，Pt纳米圆盘在表面上具有二维（111）阶域，并且台阶边缘部位的密度很高，主要具有（110）和（100）取向。观察到原子表面排列与对CO和甲醇氧化的催化活性以及电解质中的伏安曲线之间存在明显的相关性。另外，红外光谱证明存在于纳米颗粒中的低配位Pt原子具有高密度，并且线性吸附的CO是主要吸附物。将电化学研究与负载在碳上的球形Pt颗粒（Pt / C 20 wt。％，Etek）进行了比较。

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