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

doi:10.1038/s41565-018-0197-9

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 核技术应用研究中心

	Direct observation of noble metal nanoparticles transforming to thermally stable single atoms
	Cheong, WC; Wang, Y; Zheng, LR; Xiao, H; Chen, C; Wang, DS; Peng, Q; Gu, L; Han, XD; Li, J
刊名	NATURE NANOTECHNOLOGY
	2018
卷号	13 期号:9 页码:856-861
ISSN号	1748-3387
DOI	10.1038/s41565-018-0197-9
文献子类	Article
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.
电子版国际标准刊号	1748-3395
WOS关键词	OXYGEN REDUCTION REACTION ; SELECTIVE HYDROGENATION ; CO OXIDATION ; CATALYSTS ; GOLD ; OXIDE ; CERIA ; DESIGN ; ELECTROCATALYST ; NANOSTRUCTURES
WOS研究方向	Science & Technology - Other Topics ; Materials Science
语种	英语
WOS记录号	WOS:000443851800023
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286289]
专题	高能物理研究所_核技术应用研究中心高能物理研究所_实验物理中心高能物理研究所_粒子天体物理中心高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Cheong, WC,Wang, Y,Zheng, LR,et al. Direct observation of noble metal nanoparticles transforming to thermally stable single atoms[J]. NATURE NANOTECHNOLOGY,2018,13(9):856-861.
APA	Cheong, WC.,Wang, Y.,Zheng, LR.,Xiao, H.,Chen, C.,...&Zhang, QH.(2018).Direct observation of noble metal nanoparticles transforming to thermally stable single atoms.NATURE NANOTECHNOLOGY,13(9),856-861.
MLA	Cheong, WC,et al."Direct observation of noble metal nanoparticles transforming to thermally stable single atoms".NATURE NANOTECHNOLOGY 13.9(2018):856-861.