Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation

doi:10.1016/j.jechem.2016.03.010

	Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation
	Liu, Jiaxin 2,3; Qiao, Botao 1,3; Song, Yian 3; Tang, Hailian 1; Huang, Yudong 2; Liu, Jingyue (Jimmy)3
刊名	JOURNAL OF ENERGY CHEMISTRY
	2016-05-01
卷号	25 期号:3 页码:361-370
关键词	Gold Zno Nanowires Epitaxy Co Oxidation Sintering Stability
ISSN号	2095-4956
DOI	10.1016/j.jechem.2016.03.010
文献子类	Article
英文摘要	Gold was supported on commercial ZnO powders (P) and homemade ZnO nanowires (NWs) by a modified deposition precipitation method. X-ray diffraction and transmission electron microscopy investigation indicated that the size of the Au nanoparticles (NPs) depended strongly on the calcination temperature. The Au NPs were highly dispersed (< 5 nm) on both supports with calcination temperatures < 400 degrees C. However, after calcination at 600 degrees C the Au NPs aggregated much more severely on ZnO P than on ZnO NWs. Gold NPs epitaxially grew into the {10-10} facets of the ZnO NWs after calcination at temperatures > 400 degrees C. Such unique anchoring mechanism accounts for the much better experimentally observed sintering resistance. X-ray photoelectron spectra showed that Au existed as both metallic Au-0 and Au delta+ species in all the synthesized catalysts with or without calcination treatment; the ratios of Au delta+/Au-0, however, varied, depending on the treatment conditions. Catalytic tests showed that the activity for CO oxidation strongly depended on the size of the Au NPs. After calcination at 600 degrees C, the specific rate for CO oxidation at room temperature decreased about 30 times on Au/ZnO P but only about 4 times on Au/ZnO NW. Stability tests demonstrated that the Au/ZnO NW catalysts had better stability for CO oxidation. (C) 2016 Science Press and Dalian Institute of Chemical Physics. All rights reserved.
WOS关键词	METAL-SUPPORT INTERACTIONS ; LOW-TEMPERATURE OXIDATION ; CARBON-MONOXIDE ; GOLD CATALYSTS ; EPITAXIAL STABILIZATION ; PREFERENTIAL OXIDATION ; CATIONIC GOLD ; OXIDE ; HYDROGEN ; PERFORMANCE
WOS研究方向	Chemistry ; Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000380077000004
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/170330]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Qiao, Botao; Huang, Yudong; Liu, Jingyue (Jimmy)
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China 2.Harbin Inst Technol, Coll Chem Engn & Technol, Harbin 150001, Heilongjiang, Peoples R China 3.Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
推荐引用方式 GB/T 7714	Liu, Jiaxin,Qiao, Botao,Song, Yian,et al. Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation[J]. JOURNAL OF ENERGY CHEMISTRY,2016,25(3):361-370.
APA	Liu, Jiaxin,Qiao, Botao,Song, Yian,Tang, Hailian,Huang, Yudong,&Liu, Jingyue .(2016).Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation.JOURNAL OF ENERGY CHEMISTRY,25(3),361-370.
MLA	Liu, Jiaxin,et al."Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation".JOURNAL OF ENERGY CHEMISTRY 25.3(2016):361-370.