X射线光电子能谱
材料科学
纳米材料
纳米颗粒
扫描透射电子显微镜
钯
化学工程
碳纤维
透射电子显微镜
无机化学
催化作用
纳米技术
化学
复合数
有机化学
复合材料
工程类
作者
L. P. A. Guerrero-Ortega,E. Ramírez-Meneses,R. Cabrera‐Sierra,Luis Palacios,Karine Philippot,C.R. Santiago-Ramírez,L. Lartundo-Rojas,A. Manzo‐Robledo
标识
DOI:10.1007/s10853-019-03843-8
摘要
Nanomaterials based on Pd nanoparticles supported on Vulcan carbon (XC-72R) were prepared by the organometallic approach in one-pot and mild conditions (3 bar hydrogen and room temperature) using Pd(dba)2 (bis (dibenzylideneacetone) palladium (0)) as metal source and hexadecylamine (HDA) as stabilizer. High-resolution transmission electron microscopy (HR-TEM) evidenced the presence of well-dispersed Pd nanoparticles of ca. 4.5 nm mean size onto the carbon support (Pd/HDA/C). Scanning and transmission electron microscopy with electron energy loss spectroscopy (STEM-EELS) allowed to determine the chemical composition of the nanomaterials. When the Pd/HDA/C nanomaterial was submitted to heating treatment (ht) at 400 °C under air (referred as Pd/HDA/C@air-ht), X-ray photoelectron spectroscopy (XPS) and HR-TEM/STEM-EELS analyses suggested the presence of interactions between PdO and Pd(0) as a result of the formation of Pd@PdO core–shell nanoparticles. The highest oxidation current magnitude during methanol oxidation reaction is ascribed to the heat-treated material, linked with a better electron and mass transfer processes at the electrode interface. This can be attributed to electronic interactions at the core–shell formed, which might promote different redox processes at the electrode interface during CH3OH deprotonation in the alkaline electrolyte.
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