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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Structural Characterization of Ru-Modified Carbon-Supported Pt Nanoparticles Using Spontaneous Deposition with CO Oxidation Activity
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Structural Characterization of Ru-Modified Carbon-Supported Pt Nanoparticles Using Spontaneous Deposition with CO Oxidation Activity

机译：具有CO氧化活性的自发沉积Ru修饰的碳载Pt纳米颗粒的结构表征

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摘要

The modification of carbon-supported Pt nanoparticles, high performance (HP) 20% Pt on Vulcan XC-72 carbon black (Pt/C electrocatalyst), by spontaneous deposition of Ru species is examined employing electrochemical and structural techniques. Thin-layer electrodes were prepared by applying aqueous catalyst inks of Pt/C on glassy carbon (GC) disks. Ru deposition was carried out by immersion of the prepared electrode in deaerated RuCl3/ HCl4 solutions. The subsequent cyclic voltammetry experiments of the modified electrocatalysts (Ru(Pt)/C) were performed in 0.5 M H2SO4 to determine the Ru coverage and the electroactive surface. CO stripping voltammetry showed the promotional effect of Ru(Pt)/C for the CO oxidation compared to Pt/C. The structural characterization of the modified electrocatalysts was performed by transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analyses, fast Fourier transform (FFT), selected-area electron diffraction (SAED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). TEM observations revealed no appreciable signals of Ru agglomerates, and EDX confirmed the regular incorporation of Ru species to the nanoparticles. XRD analyses showed the characteristic profile of the Pt face-centered cubic (FCC) structure and the absence of crystalline Ru or Ru oxides. The application of the Williamson—Hall models indicated that Ru incorporation did not significantly affect the internal strain of the Pt nanoparticles, the increase of the crystallite size being attributed to an epitaxial growth of the Ru deposit. XPS measurements reported the presence of nonreducible RuO2 and hydrous RuO2 (RuO_xH_y) as the main Ru species in Ru(Pt)/C, the hydrous species justifying the promotional effect for the CO oxidation.
机译：通过使用电化学和结构技术，研究了通过Ru物种的自发沉积，在Vulcan XC-72炭黑（Pt / C电催化剂）上改性了碳载Pt纳米颗粒，高性能（HP）20％Pt的方法。通过将Pt / C的水性催化剂墨水涂在玻璃碳（GC）盘上来制备薄层电极。通过将制备的电极浸入脱气的RuCl3 / HCl4溶液中进行Ru沉积。随后在0.5 M H2SO4中进行了修饰的电催化剂（Ru（Pt）/ C）的循环伏安实验，以确定Ru的覆盖率和电活性表面。与Pt / C相比，CO汽提伏安法显示Ru（Pt）/ C对CO氧化的促进作用。通过透射电子显微镜（TEM），能量色散X射线（EDX）分析，快速傅里叶变换（FFT），选择区域电子衍射（SAED），X射线衍射（XRD）对改性的电催化剂进行结构表征，以及X射线光电子能谱（XPS）。 TEM观察表明，Ru团聚体没有明显的信号，而EDX证实Ru物种定期掺入纳米颗粒中。 XRD分析显示了Pt面心立方（FCC）结构的特征曲线，并且不存在结晶Ru或Ru氧化物。 Williamson-Hall模型的应用表明，Ru的掺入并没有显着影响Pt纳米颗粒的内部应变，微晶尺寸的增加归因于Ru沉积的外延生长。 XPS测量报告了Ru（Pt）/ C中主要的Ru物种是不可还原的RuO2和含水的RuO2（RuO_xH_y），这些含水的物种证明了CO氧化的促进作用。

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