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学科主题: 物理化学
题名: Coverage and Substrate Effects on the Structural Change of FeOx Nanostructures Supported on Pt
作者: Wei, Mingming1;  Fu, Qiang1;  Dong, Aiyi1;  Wang, Zhou-jun1;  Bao, Xinhe1
通讯作者: 傅强 ;  包信和
关键词: FeO ;  Pt ;  XPS ;  Oxide/metal interface ;  Oxidation ;  Reduction
刊名: TOPICS IN CATALYSIS
发表日期: 2014-06-01
DOI: 10.1007/s11244-014-0248-x
卷: 57, 期:10-13, 页:890-898
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Structural changes of FeOx nanostructures supported on Pt(111) and Pt foil with response to oxidation and reduction treatments in O-2 and H-2 atmospheres upto 1.0 bar have been investigated by using X-ray photoelectron spectroscopy and scanning tunneling microscopy. We show that submonolayer O-Fe bilayer (FeO) structure on Pt(111) can be transformed to O-Fe-O trilayer (FeO2) upon oxidation in 5.0 x 10(-6) mbar O-2, while the FeO to FeO2 transformation happens over the full FeO film only with the O-2 partial pressure above 1.0 x 10(-3) mbar. Reduction of the submonolayer FeO2 structure back to the FeO structure occurs when exposed to 1.0 mbar H-2 at room temperature (RT). In contrast, the full FeO2 structure can be kept even under 1.0 bar H-2 exposure condition. The FeOx coverage and FeOx/Pt boundary play a critical role in the redox behavior of the supported FeOx nanostructures. Furthermore, we show that the FeOx nanostructures supported on Pt foil can be oxidized in a similar way as those on the Pt(111) surface. However, the Pt foil supported FeO2 nanostructures can be more deeply reduced to the state close to metallic Fe in 1.0 mbar H-2 at RT. The close-packed Pt(111) surface exhibits a stronger confinement effect on the FeO overlayer than the open polycrystalline Pt surface.
语种: 英语
WOS记录号: WOS:000344156900008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/144279
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Wei, Mingming,Fu, Qiang,Dong, Aiyi,et al. Coverage and Substrate Effects on the Structural Change of FeOx Nanostructures Supported on Pt[J]. TOPICS IN CATALYSIS,2014,57(10-13):890-898.
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