Résumé
The homojunction of oxygen/metal vacancies and its interfacial n–p effect on the physiochemical properties are rarely reported. Interfacial n–p homojunctions of TiO2 are fabricated by directly decorating interfacial p-type titanium-defected TiO2 around n-type oxygen-defected TiO2 nanocrystals in amorphous–anatase homogeneous nanostructures. Experimental measurements and theoretical calculations on the cell lattice parameters show that the homojunction of oxygen and titanium vacancies changes the charge density of TiO2; a strong EPR signal caused by oxygen vacancies and an unreported strong titanium vacancies signal of 2D 1H TQ-SQ MAS NMR are present. Amorphous–anatase TiO2 shows significant performance regarding the photogeneration current, photocatalysis, and energy storage, owing to interfacial n-type to p-type conductivity with high charge mobility and less structural confinement of amorphous clusters. A new “homojunction of oxygen and titanium vacancies” concept, characteristics, and mechanism are proposed at an atomic-/nanoscale to clarify the generation of oxygen vacancies and titanium vacancies as well as the interface electron transfer.
| langue originale | Anglais |
|---|---|
| Numéro d'article | 1802173 |
| journal | Advanced materials |
| Volume | 30 |
| Numéro de publication | 32 |
| Les DOIs | |
| état | Publié - 9 août 2018 |
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Homojunction of Oxygen and Titanium Vacancies and its Interfacial n–p Effect. / Wu, Si Ming; Liu, Xiao Long; Lian, Xi Liang; Tian, Ge; Janiak, Christoph; Zhang, Yue Xing; Lu, Yi; Yu, Hao Zheng; Hu, Jie; Wei, Hao; Zhao, Heng; Chang, Gang Gang; Van Tendeloo, Gustaaf; Wang, Li Ying; Yang, Xiao Yu; Su, Bao Lian.
Dans: Advanced materials, Vol 30, Numéro 32, 1802173, 09.08.2018.Résultats de recherche: Contribution à un journal/une revue › Article
TY - JOUR
T1 - Homojunction of Oxygen and Titanium Vacancies and its Interfacial n–p Effect
AU - Wu, Si Ming
AU - Liu, Xiao Long
AU - Lian, Xi Liang
AU - Tian, Ge
AU - Janiak, Christoph
AU - Zhang, Yue Xing
AU - Lu, Yi
AU - Yu, Hao Zheng
AU - Hu, Jie
AU - Wei, Hao
AU - Zhao, Heng
AU - Chang, Gang Gang
AU - Van Tendeloo, Gustaaf
AU - Wang, Li Ying
AU - Yang, Xiao Yu
AU - Su, Bao Lian
PY - 2018/8/9
Y1 - 2018/8/9
N2 - The homojunction of oxygen/metal vacancies and its interfacial n–p effect on the physiochemical properties are rarely reported. Interfacial n–p homojunctions of TiO2 are fabricated by directly decorating interfacial p-type titanium-defected TiO2 around n-type oxygen-defected TiO2 nanocrystals in amorphous–anatase homogeneous nanostructures. Experimental measurements and theoretical calculations on the cell lattice parameters show that the homojunction of oxygen and titanium vacancies changes the charge density of TiO2; a strong EPR signal caused by oxygen vacancies and an unreported strong titanium vacancies signal of 2D 1H TQ-SQ MAS NMR are present. Amorphous–anatase TiO2 shows significant performance regarding the photogeneration current, photocatalysis, and energy storage, owing to interfacial n-type to p-type conductivity with high charge mobility and less structural confinement of amorphous clusters. A new “homojunction of oxygen and titanium vacancies” concept, characteristics, and mechanism are proposed at an atomic-/nanoscale to clarify the generation of oxygen vacancies and titanium vacancies as well as the interface electron transfer.
AB - The homojunction of oxygen/metal vacancies and its interfacial n–p effect on the physiochemical properties are rarely reported. Interfacial n–p homojunctions of TiO2 are fabricated by directly decorating interfacial p-type titanium-defected TiO2 around n-type oxygen-defected TiO2 nanocrystals in amorphous–anatase homogeneous nanostructures. Experimental measurements and theoretical calculations on the cell lattice parameters show that the homojunction of oxygen and titanium vacancies changes the charge density of TiO2; a strong EPR signal caused by oxygen vacancies and an unreported strong titanium vacancies signal of 2D 1H TQ-SQ MAS NMR are present. Amorphous–anatase TiO2 shows significant performance regarding the photogeneration current, photocatalysis, and energy storage, owing to interfacial n-type to p-type conductivity with high charge mobility and less structural confinement of amorphous clusters. A new “homojunction of oxygen and titanium vacancies” concept, characteristics, and mechanism are proposed at an atomic-/nanoscale to clarify the generation of oxygen vacancies and titanium vacancies as well as the interface electron transfer.
KW - energy storage
KW - homojunction of oxygen and titanium vacancy
KW - n–p effect
KW - photocatalysis
KW - titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=85051119321&partnerID=8YFLogxK
U2 - 10.1002/adma.201802173
DO - 10.1002/adma.201802173
M3 - Article
AN - SCOPUS:85051119321
VL - 30
JO - Advanced materials
JF - Advanced materials
SN - 0935-9648
IS - 32
M1 - 1802173
ER -