Direct observation of noble metal nanoparticles transforming to thermally stable single atoms

doi:10.1038/s41565-018-0197-9

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Direct observation of noble metal nanoparticles transforming to thermally stable single atoms
	Wei, SJ ; Li, A ; Liu, JC ; Li, Z ; Chen, WX ; Gong, Y ; Zhang, QH ; Cheong, WC ; Wang, Y ; Zheng, LR
刊名	NATURE NANOTECHNOLOGY
	2018
卷号	13 期号:9 页码:856-+
关键词	OXYGEN REDUCTION REACTION SELECTIVE HYDROGENATION CO OXIDATION CATALYSTS GOLD OXIDE CERIA DESIGN ELECTROCATALYST NANOSTRUCTURES
ISSN号	1748-3387
DOI	10.1038/s41565-018-0197-9
文献子类	期刊论文
英文摘要	Single noble metal atoms and ultrafine metal clusters catalysts tend to sinter into aggregated particles at elevated temperatures, driven by the decrease of metal surface free energy. Herein, we report an unexpected phenomenon that noble metal nanoparticles (Pd, Pt, Au-NPs) can be transformed to thermally stable single atoms (Pd, Pt, Au-SAs) above 900 degrees C in an inert atmosphere. The atomic dispersion of metal single atoms was confirmed by aberration-corrected scanning transmission electron microscopy and X-ray absorption fine structures. The dynamic process was recorded by in situ environmental transmission electron microscopy, which showed competing sintering and atomization processes during NP-to-SA conversion. Further, density functional theory calculations revealed that high-temperature NP-to-SA conversion was driven by the formation of the more thermodynamically stable Pd-N-4 structure when mobile Pd atoms were captured on the defects of nitrogen-doped carbon. The thermally stable single atoms (Pd-SAs) exhibited even better activity and selectivity than nanoparticles (Pd-NPs) for semi-hydrogenation of acetylene.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/30903]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai, Peoples R China 2.Tsinghua Univ, Dept Chem, Beijing, Peoples R China 3.Beijing Univ Technol, Beijing Key Lab Microstruct & Property Adv Mat, Beijing, Peoples R China 4.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing, Peoples R China 5.Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wei, SJ,Li, A,Liu, JC,et al. Direct observation of noble metal nanoparticles transforming to thermally stable single atoms[J]. NATURE NANOTECHNOLOGY,2018,13(9):856-+.
APA	Wei, SJ.,Li, A.,Liu, JC.,Li, Z.,Chen, WX.,...&Li, YD.(2018).Direct observation of noble metal nanoparticles transforming to thermally stable single atoms.NATURE NANOTECHNOLOGY,13(9),856-+.
MLA	Wei, SJ,et al."Direct observation of noble metal nanoparticles transforming to thermally stable single atoms".NATURE NANOTECHNOLOGY 13.9(2018):856-+.