Different Reactivity of Rutile and Anatase TiO2 Nanoparticles: Synthesis and Surface States of Nanoparticles of Mixed-Valence Magneli Oxides

被引:4
|
作者
Baktash, Elham [1 ]
Capitolis, Jerome [1 ]
Tinat, Lionel [1 ]
Larquet, Clement [1 ]
Chang, Tsou Hsi Camille Chan [1 ]
Gallet, Jean-Jacques [2 ,3 ]
Bournel, Fabrice [2 ,3 ]
Sanchez, Clement [1 ]
Carenco, Sophie [1 ]
Portehault, David [1 ]
机构
[1] Sorbonne Univ, Lab Chim Mat Condensee Paris CMCP, CNRS, Coll France, 4 Pl Jussieu, F-75005 Paris, France
[2] Sorbonne Univ, CNRS, Lab Chim Phys Mat & Rayonnement LPCMR, 4 Pl Jussieu, F-75005 Paris, France
[3] Synchrotron SOLEIL, BP 48, F-91192 Gif Sur Yvette, France
关键词
Magneli phases; mixed-valence compounds; nanoparticles; photoelectron spectroscopy; titanium oxides; PHASE TI8O15 NANOWIRES; TITANIUM-OXIDE; SUPPORT;
D O I
10.1002/chem.201901592
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Magneli phases TinO2n-1 (3<n <= 10) are mixed Ti4+/Ti3+ oxides with high electrical conductivity. When used for water remediation or electrochemical energy storage and conversion, they are nanostructured and exposed to various environments. Therefore, understanding their surface reactivity is of prime importance. Such studies have been hindered by carbon contamination from syntheses. Herein, this synthetic and characterization challenge is addressed through a new approach to 50 nm carbon-free Ti4O7 and Ti6O11 nanoparticles. It takes advantage of the different reactivities of rutile and anatase TiO2 nanoparticles towards H-2, to use the former as precursor of TinO2n-1 and the latter as a diluting agent. This approach is combined with silica templating to restrain particle growth. The surface reactivity of the Magneli nanoparticles under different atmospheres was then evaluated quantitatively by synchrotron-radiation-based X-ray photoelectron spectroscopy, which revealed oxidized surfaces with lower conductivity than the core. This finding sheds a new light on the charge transfer occurring in these materials.
引用
收藏
页码:11114 / 11120
页数:7
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