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Influence of structural features on the photocatalytic activity of NaTaO3 powders from different synthesis methods

Paper ID Volume ID Publish Year Pages File Format Full-Text
43341 45965 2007 7 PDF Available
Title
Influence of structural features on the photocatalytic activity of NaTaO3 powders from different synthesis methods
Abstract

Perovskite-like NaTaO3 photocatalyst powders have generally been synthesized with a solid-state method, which formed the orthorhombic phase that has a direct band gap and a Ta–O–Ta bond angle of ca. 163°. The present work reports a sol–gel synthesis, in which NaTaO3 nanoparticles were obtained at a temperature as low as 500 °C by using sodium acetate and tantalum chloride as the starting materials and citric acid as the complexing agent. Because of the low-temperature condition used in the synthesis, the sol–gel NaTaO3 was of the monoclinic phase that has an indirect band gap, high densities of states near the band edges, and a Ta–O–Ta bond angle close to 180°. Thanks to the surface area as well as the electronic and crystalline structures, the sol–gel NaTaO3 was considered more favorable to photocatalytic reactions than the solid-state material. This interpretation was supported by the finding that the sol–gel NaTaO3 exhibited a remarkably higher photocatalytic activity in water splitting than the solid-state material.

Graphical abstractThe sol–gel synthesized NaTaO3 showed an indirect bandgap, i.e. phonons involved in transition, and a higher water-splitting rate under illumination than the solid state one. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
NaTaO3; Tantalates; Photocatalysis; Water splitting
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Influence of structural features on the photocatalytic activity of NaTaO3 powders from different synthesis methods
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 331, 2007, Pages 44–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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