Citation: WANG Xiang, LI Ren-Gui, XU Qian, HAN Hong-Xian, LI Can. Roles of (001) and (101) Facets of Anatase TiO₂ in Photocatalytic Reactions[J]. Acta Physico-Chimica Sinica, ;2013, 29(07): 1566-1571. doi: 10.3866/PKU.WHXB201304284 shu

Roles of (001) and (101) Facets of Anatase TiO₂ in Photocatalytic Reactions

WANG Xiang ^1,2 ,
LI Ren-Gui ^1,2 ,
XU Qian ¹ ,
HAN Hong-Xian ¹ ,
LI Can ^1,

1.
1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning Province, P. R. China;
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 3 April 2013
Available Online: 28 April 2013
Fund Project: 国家自然科学基金(21090341, 21061140361)资助项目 (21090341, 21061140361)

Single crystals of anatase TiO₂ with exposed (001) and (101) facets were synthesized by a hydrothermal method. We carried out photocatalytic reduction reactions to deposit noble metals (Au, Ag, and Pt) and photocatalytic oxidation reactions to deposit metal oxides (PbO₂ and MnO_x) on the surface of TiO₂. The deposited anatase TiO₂ samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS) to study the roles of the two facets of anatase TiO₂ in photocatalytic reactions. The noble metals were selectively deposited on the exposed (101) facet, while metal oxides were selectively deposited on the exposed (001) facet. This result indicated that photogenerated electrons and holes mainly accumulated on the (101) and (001) facets, and then took part in photocatalytic reduction and oxidation reactions, respectively. These results also suggested that the simultaneous exposure of the two facets could facilitate charge separation. Therefore, it was proposed that the simultaneous exposure of two facets with different functions will be a new strategy to effectively promote photocatalytic reaction.
- TiO₂,
- Anatase,
- Photocatalysis,
- Crystal facet,
- Charge separation
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Roles of (001) and (101) Facets of Anatase TiO2 in Photocatalytic Reactions

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通讯作者: 陈斌, bchen63@163.com

Roles of (001) and (101) Facets of Anatase TiO₂ in Photocatalytic Reactions