Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 708, Issue -, Pages 358-366Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.03.046
Keywords
Tungsten oxide; Exposed facet tuning; Oxygen vacancy; Solar light photocatalysis; Charge transfer
Categories
Funding
- National Basic Research Program of China (973 Program) [2013CB934301]
- National Science Foundation of China [51672016, 51472013]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF201602]
- Beijing Key Discipline Foundation of Condensed Matter Physics
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It is known that the exposed facet and defect state are crucial to the photocatalytic performance. Here, we report that the exposed facets of the building blocks in the tungsten oxide hierarchical nanostructures could be controlled by adjusting the amount of formamide in the hydrothermal precursor solution and the oxygen vacancies were successfully introduced through the post-air annealing. It is found that exposing high percentage (020) facet is unbeneficial for the photocatalytic performance and (200) and (002) facets should be the photocatalytic active facets of the hexagonal tungsten oxide. The hexagonal tungsten oxide with oxygen vacancies and maximum (200) and (002) facets archives highest photocatalytic performance in degrading rhodamine B under simulated solar light irradiation, which the rate constant per specific surface area (k/SBET) is 7.3 times as high as the sample without oxygen vacancies and minimum (200) and (002) facets. Both introducing oxygen vacancies and exposing (200) and (002) facets can enhance the separation efficiency of photo-generated charges, thus improving the photocatalytic performance. (C) 2017 Elsevier B.V. All rights reserved.
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