期刊
CRYSTENGCOMM
卷 17, 期 39, 页码 7528-7534出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ce01263e
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资金
- NSF of China [51125006, 91122034, 51272270, 61376056]
- STC of Shanghai [13JC1405700, 14520722000, 14YF1406500]
- Shanghai Technical Platform for Testing and Characterization on Inorganic Materials [14DZ2292900]
Black titania has attracted enormous attention due to its enhanced photocatalytic activity via increased solar absorption, but few studies extended the investigations to other wide band-gap titanates. Herein, strontium titanate (SrTiO3), a typical ternary titanate with more potential in photocatalysis, is selected as the target material. Black SrTiO3 nanocrystals were obtained by molten aluminum reduction of solution-processed pristine SrTiO3 in a two-zone furnace. Different from the black titania, black SrTiO3 nanocrystals are well-crystallized and have no core-shell structure. Substantial Ti3+ cations and oxygen vacancies are introduced into SrTiO3 after aluminum reduction, which results in enhanced absorption in both visible and near-infrared regions, and improved charge separation and transport. The photocatalytic hydro-gengeneration and photoelectrochemical investigations demonstrate that black SrTiO3 exhibits an impressive improvement (2.5 times and 2.4 times at 1.23 V-RHE, respectively) compared with white SrTiO3.
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