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Issue 37, 2016
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Synthesis of high-purity, layered structured K2Ta4O11 intermediate phase nanocrystals for photocatalytic water splitting

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Abstract

High-purity K2Ta4O11 (kalitantite) intermediate phase with a layered structure, as a new family member of alkali-metal tantalate semiconductors, was successfully prepared via a simple and cost-effective flux growth technique using potassium chloride (KCl) at a low temperature of 800 °C for only 4 h. The as-synthesized K2Ta4O11 was characterized by XRD, SEM, TEM, STEM/EDS, and UV-Vis DRS, etc. It was found that the K2Ta4O11 single nanocrystals were non-stoichiometric in the size range of 100–500 nm, and the indirect band gap of K2Ta4O11 was correctly determined to be 4.15 eV. The K2Ta4O11 not only exhibited a high and stable photocatalytic H2 generation rate of ∼45.3 μmol h−1 g−1 in an aqueous methanolic solution with the photodeposition of Pt as co-catalysts, but also possessed the photocatalytic ability for simultaneous evolution of H2 and O2 in a stoichiometric ratio, with loading of NiO particles as cocatalysts. Thus, it can be mainly attributed to the benefits of KCl flux lowing the reaction temperature, and increasing the surface area and crystallinity of K2Ta4O11, that the charge efficiency and enhancement of the photoreactivity for water splitting are improved.

Graphical abstract: Synthesis of high-purity, layered structured K2Ta4O11 intermediate phase nanocrystals for photocatalytic water splitting

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Publication details

The article was received on 29 Apr 2016, accepted on 01 Jul 2016 and first published on 04 Jul 2016


Article type: Paper
DOI: 10.1039/C6CP02868C
Citation: Phys. Chem. Chem. Phys., 2016,18, 25831-25836
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    Synthesis of high-purity, layered structured K2Ta4O11 intermediate phase nanocrystals for photocatalytic water splitting

    P. Wang, F. Sun, J. H. Kim, J. H. Kim, J. Yang, X. Wang and J. S. Lee, Phys. Chem. Chem. Phys., 2016, 18, 25831
    DOI: 10.1039/C6CP02868C

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