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Enhancing Photocatalytic Activity of Nb2O5−x for Aerobic Oxidation Through Synergy of Oxygen Vacancy and Porosity

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A major reduction in energy consumption and the costs of catalysts will be required in future chemical manufacturing processes. To reach this goal, the transitional metal oxides (TMOs) as photocatalysts under solar energy have been widely studied. Nb2O5, as a promising photocatalyst, has attracted increasing attention owing to their unique properties. However, the intrinsic large bandgap of Nb2O5 hinder its potential applications in a variety of fields. Herein, we report an effective and simple strategy to synthesize black mesoporous Nb2O5−x nanorods (BMNb) with abundant oxygen vacancies. The formation of oxygen vacancy reduces the bandgap of Nb2O5 which extend the photoresponse from the ultraviolet to the visible and infrared light regions. In addition, The mesoporous structure of BMNb lead to a higher surface area than the as-prepared Nb2O5 precursor (36.24 m2/g cf 8.69 m2/g). Benefitting from coordinated regulation of structure and composition, the BMNb exhibits better photocatalytic performance than Nb2O5 in aerobic oxidative coupling of amines to imines under visible light irradiation at room temperature. The yield of BMNb for benzylamine oxidation increases by 63% over the Nb2O5. This work could open new perspectives to design TMOs with enhanced photocatalytic properties.
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Keywords: Aerobic Coupling; Microstructure; Niobium Oxide; Particles; Photocatalyst

Document Type: Research Article

Affiliations: 1: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, P.O. Box 98, Beijing 100029, China 2: UCL School of Pharmacy, University College London, 29–39 Brunswick Square, London, WC1N 1AX, UK

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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