Experimental evidence for electron localization on Au upon photo-activation of Au/anatase catalysts

被引：38

作者：

Carneiro, Joana T.

Savenije, Tom J. ^{[1
]}

Mul, Guido ^{[1
]}

机构：

[1] Delft Univ Technol, DelftChem Tech, Optoelect Mat Sect, NL-2628 BL Delft, Netherlands

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2009年 / 11卷 / 15期

关键词：

PHOTOCATALYTIC DEGRADATION; CHARGE SEPARATION; CARRIER DYNAMICS; TIO2; GOLD; AU/TIO2; EFFICIENCY; FILMS; TIME; NANOPARTICLES;

D O I：

10.1039/b820425j

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：

Time resolved microwave conductivity (TRMC) measurements show that the presence of Au on anatase Hombikat UV100 significantly reduces the lifetime of mobile electrons formed by photo-excitation of this photocatalyst in 300 nm. providing evidence for the widely acclaimed electron localization effect of Au in promoting TiO2 photocatalysts. Electron localization efficiency of Au Was even higher for Au-promoted Hombikat calcined in 400 degrees C, explained by enlargement of the anatase Particle size and the associated, relatively larger fraction of anatase particles in direct contact with Au.

引用

收藏

页码：2708 / 2714

页数：7

相关论文

共 29 条

[1] INFLUENCE OF LIGHT-INTENSITY AND MEMBRANE-PROPERTIES ON THE PHOTOCATALYTIC DEGRADATION OF FORMIC-ACID OVER TIO2 CERAMIC MEMBRANES [J].

AGUADO, MA ;

ANDERSON, MA ;

HILL, CG .

JOURNAL OF MOLECULAR CATALYSIS, 1994, 89 (1-2) :165-178

[2] Charge carrier dynamics at TiO2 particles: Reactivity of free and trapped holes [J].

Bahnemann, DW ;

Hilgendorff, M ;

Memming, R .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (21) :4265-4275

[3] Gold: A relatively new catalyst [J].

Bond, GC .

GOLD BULLETIN, 2001, 34 (04) :117-140

[4] How Gold Deposition Affects Anatase Performance in the Photo-catalytic Oxidation of Cyclohexane [J].

Carneiro, Joana T. ;

Yang, Chieh-Chao ;

Moma, John A. ;

Moulijn, Jacob A. ;

Mul, Guido .

CATALYSIS LETTERS, 2009, 129 (1-2) :12-19

[5] Photoinduced reactivity of titanium dioxide [J].

Carp, O ;

Huisman, CL ;

Reller, A .

PROGRESS IN SOLID STATE CHEMISTRY, 2004, 32 (1-2) :33-177

[6] Preparation of highly uniform Ag/TiO2 and Au/TiO2 supported nanoparticle catalysts by photodeposition [J].

Chan, SC ;

Barteau, MA .

LANGMUIR, 2005, 21 (12) :5588-5595

[7] PLATINUM TITANIUM-DIOXIDE CATALYSTS - A PHOTOCONDUCTIVITY STUDY OF ELECTRON-TRANSFER FROM THE ULTRAVIOLET-ILLUMINATED SUPPORT TO THE METAL AND OF THE INFLUENCE OF HYDROGEN [J].

DISDIER, J ;

HERRMANN, JM ;

PICHAT, P .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1983, 79 :651-660

[8] Phenol photodegradation on platinized-TiO2 photocatalysts related to charge-carrier dynamics [J].

Emilio, CA ;

Litter, MI ;

Kunst, M ;

Bouchard, M ;

Colbeau-Justin, C .

LANGMUIR, 2006, 22 (08) :3606-3613

[9] Ultrafast plasmon-induced electron transfer from gold nanodots into TiO2 nanoparticles [J].

Furube, Akihiro ;

Du, Luchao ;

Hara, Kohjiro ;

Katoh, Ryuzi ;

Tachiya, Masanori .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (48) :14852-+

[10] Local field effects on electron transport in nanostructured TiO2 revealed by terahertz spectroscopy [J].

Hendry, E ;

Koeberg, M ;

O'Regan, B ;

Bonn, M .

NANO LETTERS, 2006, 6 (04) :755-759