Morphologically different WO3 nanocrystals in photoelectrochemical water oxidation |
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Authors: | Soumya Kanti Biswas Jin-Ook Baeg Sang-Jin Moon Ki-jeong Kong Won-Wook So |
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Institution: | (1) Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology, Yusong, Daejeon, 305-600, Republic of Korea; |
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Abstract: | Different morphologies of WO3 nanocrystals such as nanorods and nanoplates have been obtained under hydrothermal conditions using ammonium metatungstate
as the precursor in presence of different organic acids such as citric, oxalic, and tartaric acid in the reaction medium.
Detailed characterization of the crystal structure, particle morphology, and optical band gap of the synthesized powders have
been done by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and solid-state UV–visible
spectroscopy study. The as-synthesized materials are WO3 hydrates with orthorhombic phase which transform to the hexagonal WO3 through dehydration upon heating at 350 °C. The resultant products are crystalline with nanoscale dimensions. Finally, the
photoactivity of the synthesized materials annealed at 500 °C has been compared employing in photoelectrochemical water oxidation
under the illumination of AM 1.5G simulated solar light (100 mWcm−2). The photocurrent measurements upon irradiation of light exhibit obvious photocatalytic activity with a photocurrent of
about 0.77, 0.61, and 0.65 mAcm−2 for the WO3 film derived with the oxalic acid, tartaric, and citric acid assisting agents, respectively, at 1.8 V versus Ag/AgCl electrode. |
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