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Tungsten Oxide Nanoplate Film as a Highly Active Solar-Driven Photocatalyst

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A WO3 nanoplate-like film with an average edge width of approximately 20 nm and thickness of approximately 250 nm was fabricated via electrochemical anodization of W film at 60 V in a bath with electrolytes composed of ethylene glycol and 0.7 wt% NH4F. The influence of applied potential on the morphology of the anodic oxide was investigated. The growth of the nanoplate-like morphology might be attributed to the competition between electrochemical oxide formation and chemical etching by the corrosive [WFn](n-6) complex ions at minimal applied potential of 60 V. In addition, the presence of tungstite (WO3˙H2O) with an orthorhombic structure was observed within the WO3 nanoplate-like film, which has a layered structure with sheets of distorted W–O octahedral units sharing corners. All of the anodic WO3 nanostructured films were annealed and their electrochemical ability was investigated under solarillumination. A maximum photocurrent density of 1.50 mA/cm2 was observed for the WO3 nanoplate-like film because more incident photons could be harvested to generate photo-induced charge carriers under solar-illumination.
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Keywords: Electrochemical anodization; WO3 nanoplate; photoelectrochemical; solar-illumination

Document Type: Research Article

Publication date: August 1, 2015

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  • Current Nanoscience publishes authoritative reviews and original research reports, written by experts in the field on all the most recent advances in nanoscience and nanotechnology. All aspects of the field are represented including nano- structures, synthesis, properties, assembly and devices. Applications of nanoscience in biotechnology, medicine, pharmaceuticals, physics, material science and electronics are also covered. The journal is essential to all involved in nanoscience and its applied areas.
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