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Shape Evolution of Hierarchical W18O49 Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
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Academic Editor: Thomas Nann
Nanomaterials 2016, 6(12), 240; https://doi.org/10.3390/nano6120240
Received: 13 November 2016 / Revised: 2 December 2016 / Accepted: 6 December 2016 / Published: 14 December 2016
Hierarchical tungsten oxide assemblies such as spindle-like structures, flowers with sharp petals, nanowires and regular hexagonal structures are successfully synthesized via a solvothermal reduction method by simply adjusting the reaction conditions. On the basis of the experimental results, it is determined that the reaction time significantly influences the phase transition, microstructure and photocatalytic activity of the prepared samples. The possible mechanisms for the morphology evolution process have been systematically proposed. Moreover, the as-prepared products exhibit significant morphology-dependent photocatalytic activity. The flower-like W18O49 prepared at 6 h possesses a large specific surface area (150.1 m2∙g−1), improved separation efficiency of electron-hole pairs and decreased electron-transfer resistance according to the photoelectrochemical measurements. As a result, the flower-like W18O49 prepared at 6 h exhibits the highest photocatalytic activity for the degradation of Methyl orange aqueous solution. The radical trap experiments showed that the degradation of MO was driven mainly by the participation of h+ and •O2 radicals. View Full-Text
Keywords: W18O49; microstructure; phase transformation; photocatalytic activity W18O49; microstructure; phase transformation; photocatalytic activity
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Hai, G.; Huang, J.; Cao, L.; Jie, Y.; Li, J.; Wang, X. Shape Evolution of Hierarchical W18O49 Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities. Nanomaterials 2016, 6, 240.

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