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	Interactions of Ni Nanoparticles with Reducible CeO2(111) Thin Films
	Zhou, Yinghui ; Zhou YH(周颖慧) ; Zhou, Jing
	2012-05-03
关键词	METAL-ORGANIC FRAMEWORK CARBON-DIOXIDE CO2 CAPTURE ADSORPTION EQUILIBRIUM MOLECULAR SIMULATION ACTIVATED CARBON GAS-ADSORPTION SEPARATION ZEOLITES PURIFICATION
英文摘要	The interaction between Ni and ceria was investigated under ultrahigh vacuum conditions using model Ni/ceria systems consisting of Ni nanoparticles vapor-deposited on well-ordered CeOx(111) (1.5 < x < 2) thin films grown on Ru(0001). As indicated by X-ray photoelectron spectroscopy studies, metallic Ni is the only species present on the reduced ceria. Ni-0 is the predominate species observed upon deposition of a submonolayer of Ni on CeO2 at 300 K. However, a small amount of Ni is oxidized to Ni2+. A decreased ratio of Ni2+ to Ni-0 was observed with further increase of Ni coverage. Oxidation of Ni on CeO2 can be facilitated by annealing as well as by depositing Ni at 500 K. Scanning tunneling microscopy studies show that Ni forms two-dimensional particles on ceria at room temperature, which suggests a strong Ni-ceria interaction. Upon deposition at 500 K, metallic Ni particles as well as NiO particles can be formed on the reduced and oxidized ceria, respectively. NiO particles exhibit a flatter particle shape than that of Ni particles. Our results can be explained by thermodynamics as well as by previous computational studies.; U.S. Department of Energy Office of Fossil Energy (FE); U.S. Department of Energy by Battelle Memorial Institute [DE-AC05-76RL01830]
语种	英语
出版者	AMER CHEMICAL SOC
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1021/jp300259y]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	Zhou, Yinghui,Zhou YH,Zhou, Jing. Interactions of Ni Nanoparticles with Reducible CeO2(111) Thin Films[J],2012.
APA	Zhou, Yinghui,周颖慧,&Zhou, Jing.(2012).Interactions of Ni Nanoparticles with Reducible CeO2(111) Thin Films..
MLA	Zhou, Yinghui,et al."Interactions of Ni Nanoparticles with Reducible CeO2(111) Thin Films".(2012).

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