Effect of the Specific Surface Sites on the Reducibility of α-Fe2O3/Graphene Composites by Hydrogen

被引：13

作者：

Papaefthimiou, V. ^{[1
]}

Florea, I. ^{[2
]}

Baaziz, W. ^{[1
]}

Janowska, I. ^{[1
]}

Doh, W. H. ^{[1
]}

Begin, D. ^{[1
]}

Blume, R. ^{[3
]}

Knop-Gericke, A. ^{[4
]}

Ersen, O. ^{[2
]}

Pham-Huu, C. ^{[1
]}

Zafeiratos, S. ^{[1
]}

机构：

[1] Univ Strasbourg, ECPM, CNRS, UMR 7515,ICPEES, F-67087 Strasbourg 8, France

[2] Univ Strasbourg, CNRS, UMR 7504, IPCMS, F-67034 Strasbourg 2, France

[3] Helmholtz Zentrum Berlin, Abt Solar Energie Forsch AG Energie Katalyse, D-12489 Berlin, Germany

[4] Fritz Haber Inst MPG, D-14195 Berlin, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 39期

关键词：

X-RAY-ABSORPTION; IRON; GRAPHENE; SPECTROSCOPY; OXIDATION; NANOPARTICLES; PERFORMANCE; CATALYSTS;

D O I：

10.1021/jp4067718

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The reducibility of iron oxide nanoparticles (NPs) supported over few layer thick graphite upon annealing in hydrogen is investigated by near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), X-ray absorption spectroscopy (XAS), electron energy loss spectroscopy (EELS), and high resolution transmission electron microscopy (HR-TEM). It is found that the stability of the iron oxide NPs toward reduction is enhanced by the interaction with the graphene nanosheets as compared to the bulk iron oxide. Postannealing TEM micrographs reveal the existence of both core/shell and homogeneous iron oxide NPs with the latter forming irregular trenches into the graphene sheets. EELS analysis and TEM images clearly demonstrate that the reducibility of iron oxide particles depends on the specific graphene site on which they are attached Furthermore, we show that graphene etching can be mediated by iron oxide NPs at relatively mild reduction conditions.

引用

页码：20313 / 20319

页数：7

共 51 条

[1] X-ray absorption and diffraction studies of thin polymer/FePt nanoparticle assemblies [J].

Anders, S ;

Toney, MF ;

Thomson, T ;

Farrow, RFC ;

Thiele, JU ;

Terris, BD ;

Sun, S ;

Murray, CB .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) :6299-6304

[2] Sonochemical synthesis of nanosized hollow hematite [J].

Bang, Jin Ho ;

Suslick, Kenneth S. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (08) :2242-+

[3] Facile autoreduction of iron oxide/carbon nanotube encapsulates [J].

Chen, W ;

Pan, XL ;

Willinger, MG ;

Su, DS ;

Bao, XH .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (10) :3136-3137

[4] ELECTRON-ENERGY-LOSS-SPECTROSCOPY NEAR-EDGE FINE-STRUCTURES IN THE IRON-OXYGEN SYSTEM [J].

COLLIEX, C ;

MANOUBI, T ;

ORTIZ, C .

PHYSICAL REVIEW B, 1991, 44 (20) :11402-11411

[5] Water-Soluble Magnetic-Functionalized Reduced Graphene Oxide Sheets: In situ Synthesis and Magnetic Resonance Imaging Applications [J].

Cong, Huai-Ping ;

He, Jia-Jun ;

Lu, Yang ;

Yu, Shu-Hong .

SMALL, 2010, 6 (02) :169-173

[6] X-RAY-ABSORPTION SPECTROSCOPY AT THE FE L(2,3) THRESHOLD IN IRON-OXIDES [J].

CROCOMBETTE, JP ;

POLLAK, M ;

JOLLET, F ;

THROMAT, N ;

GAUTIERSOYER, M .

PHYSICAL REVIEW B, 1995, 52 (05) :3143-3150

[7] Chemical oxidation of multiwalled carbon nanotubes [J].

Datsyuk, V. ;

Kalyva, M. ;

Papagelis, K. ;

Parthenios, J. ;

Tasis, D. ;

Siokou, A. ;

Kallitsis, I. ;

Galiotis, C. .

CARBON, 2008, 46 (06) :833-840

[8] Crystallographic etching of few-layer graphene [J].

Datta, Sujit S. ;

Strachan, Douglas R. ;

Khamis, Samuel M. ;

Johnson, A. T. Charlie .

NANO LETTERS, 2008, 8 (07) :1912-1915

[9] High resolution X-ray emission and X-ray absorption spectroscopy [J].

de Groot, F .

CHEMICAL REVIEWS, 2001, 101 (06) :1779-1808

[10] On the Surface Chemistry of Iron Oxides in Reactive Gas Atmospheres [J].

de Smit, Emiel ;

van Schooneveld, Matti M. ;

Cinquini, Fabrizio ;

Bluhm, Hendrik ;

Sautet, Phillippe ;

de Groot, Frank M. F. ;

Weckhuysen, Bert M. .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2011, 50 (07) :1584-1588

← 1 2 3 4 5 6 →