期刊
ADVANCED MATERIALS
卷 30, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201802173
关键词
energy storage; homojunction of oxygen and titanium vacancy; n-p effect; photocatalysis; titanium dioxide
类别
资金
- National Key R&D Program of China [2017YFC1103800]
- National SFC [U1662134, U1663225, 51472190, 51611530672, 21711530705, 51503166, 21706199]
- ISTCP [2015DFE52870]
- PCSIRT [IRT_15R52]
- HPNSF [2016CFA033, 2017CFB487]
- SKLPPC [PPC2016007]
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 H-1 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.
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