镍
X射线吸收光谱法
催化作用
铂金
Atom(片上系统)
材料科学
非阻塞I/O
吸收光谱法
扫描透射电子显微镜
透射电子显微镜
结晶学
物理化学
化学
纳米技术
冶金
嵌入式系统
物理
量子力学
生物化学
计算机科学
作者
Sunkyu Kim,Erdem Sasmaz
出处
期刊:Chemcatchem
[Wiley]
日期:2022-08-16
卷期号:14 (20)
被引量:3
标识
DOI:10.1002/cctc.202200568
摘要
Abstract The well‐dispersed Pt atoms on Ni have shown excellent coke resistance during methane reforming. In this work, we performed detailed characterization experiments using aberration‐corrected high‐angle annular dark‐field scanning transmission electron microscopy (AC‐HAADF‐STEM), and X‐ray absorption spectroscopy (XAS) to elucidate the formation of different Pt structures with respect to Pt/Ni atomic ratios. The Pt−Ni single‐atom alloys (SAAs) in Pt/Ni‐CeO 2 @SiO 2 yolk‐shell nanotube structures are synthesized by reducing Pt single atoms supported on the NiO surface as single‐atom catalysts (SACs). Pt−Ni SAAs show Pt−Ni contribution in the first shell with the coordination number of 5 without any Pt−Pt and Pt−O interactions, implying Pt atoms are isolated on the outermost layer of Ni species. However, Pt clusters can be detected at Pt/Ni atomic ratios higher than 0.008. The well‐dispersed Pt single atoms on Ni show high activity while maintaining their structure in dry reforming of methane condition at 773 K, verifying the excellent stability of the Pt−Ni SAA morphology.
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