Enhancing Photoactivity of TiO2(B)/Anatase Core-Shell Nanofibers by Selectively Doping Cerium Ions into the TiO2(B) Core

doi:10.1002/chem.201202719

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	Enhancing Photoactivity of TiO2(B)/Anatase Core-Shell Nanofibers by Selectively Doping Cerium Ions into the TiO2(B) Core
	Yang, Dongjiang 1,2; Zhao, Jian 2; Liu, Hongwei 2; Zheng, Zhanfeng 2; Adebajo, Moses O.2; Wang, Hongxia 2; Liu, Xiaotang 3; Zhang, Hongjie 4; Zhao, Jin-cai 5; Bell, John 2
刊名	CHEMISTRY-A EUROPEAN JOURNAL
	2013-04-01
卷号	19 期号:16 页码:5113-5119
关键词	Cerium Doping Nanostructures Photocatalysts Titanates
ISSN号	0947-6539
DOI	10.1002/chem.201202719
英文摘要	Cerium ions (Ce3+) can be selectively doped into the TiO2(B) core of TiO2(B)/anatase coreshell nanofibers by means of a simple one-pot hydrothermal treatment of a starting material of hydrogen trititanate (H2Ti3O7) nanofibers. These Ce3+ ions (approximate to 0.202nm) are located on the (110) lattice planes of the TiO2(B) core in tunnels (width approximate to 0.297nm). The introduction of Ce3+ ions reduces the defects of the TiO2(B) core by inhibiting the faster growth of (110) lattice planes. More importantly, the redox potential of the Ce3+/Ce4+ couple (E degrees(Ce3+/Ce4+)=1.715V versus the normal hydrogen electrode) is more negative than the valence band of TiO2(B). Therefore, once the Ce3+-doped nanofibers are irradiated by UV light, the doped Ce3+ ionsin close vicinity to the interface between the TiO2(B) core and anatase nanoshellcan efficiently trap the photogenerated holes. This facilitates the migration of holes from the anatase shell and leaves more photogenerated electrons in the anatase nanoshell, which results in a highly efficient separation of photogenerated charges in the anatase nanoshell. Hence, this enhanced charge-separation mechanism accelerates dye degradation and alcohol oxidation processes. The one-pot treatment doping strategy is also used to selectively dope other metal ions with variable oxidation states such as Co2+/3+ and Cu+/2+ ions. The doping substantially improves the photocatalytic activity of the mixed-phase nanofibers. In contrast, the doping of ions with an invariable oxidation state, such as Zn2+, Ca2+, or Mg2+, does not enhance the photoactivity of the mixed-phase nanofibers as the ions could not trap the photogenerated holes.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000317399600022
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/54285]
专题	中国科学院化学研究所
通讯作者	Yang, Dongjiang
作者单位	1.Qingdao Univ, Coll Chem Chem & Environm Engn, Lab Fiber Mat & Modern Text, Growing Base,State Key Lab, Qingdao 266071, Peoples R China 2.Queensland Univ Technol, Discipline Chem, Brisbane, Qld 4001, Australia 3.South China Agr Univ, Coll Sci, Guangzhou 510642, Guangdong, Peoples R China 4.Chinese Acad Sci, Changchun Inst Appl Chem, Changchun 130022, Peoples R China 5.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Yang, Dongjiang,Zhao, Jian,Liu, Hongwei,et al. Enhancing Photoactivity of TiO2(B)/Anatase Core-Shell Nanofibers by Selectively Doping Cerium Ions into the TiO2(B) Core[J]. CHEMISTRY-A EUROPEAN JOURNAL,2013,19(16):5113-5119.
APA	Yang, Dongjiang.,Zhao, Jian.,Liu, Hongwei.,Zheng, Zhanfeng.,Adebajo, Moses O..,...&Zhu, Huaiyong.(2013).Enhancing Photoactivity of TiO2(B)/Anatase Core-Shell Nanofibers by Selectively Doping Cerium Ions into the TiO2(B) Core.CHEMISTRY-A EUROPEAN JOURNAL,19(16),5113-5119.
MLA	Yang, Dongjiang,et al."Enhancing Photoactivity of TiO2(B)/Anatase Core-Shell Nanofibers by Selectively Doping Cerium Ions into the TiO2(B) Core".CHEMISTRY-A EUROPEAN JOURNAL 19.16(2013):5113-5119.