Monoclinic鈥揟etragonal Heterostructured BiVO4 by Yttrium Doping with Improved Photocatalytic Activity

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• 作者：Sara Usai ; Sergio Obreg贸n ; Ana Isabel Becerro ; Gerardo Col贸n
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：117
• 期：46
• 页码：24479-24484
• 全文大小：411K
• 年卷期：v.117,no.46(November 21, 2013)
• ISSN：1932-7455

文摘

Yttrium-doped BiVO₄ has been synthesized by means of a surfactant free hydrothermal method having good photoactivities under sun-like excitation for the degradation of Methylene Blue (MB). From the structural and morphological characterization it has been stated that the presence of Y³⁺ induces the progressive stabilization of the tetragonal phase and the slight higher surface area values. By following the tetragonal cell parameters, the substitutional incorporation of Y³⁺ into the BiVO₄ tetragonal lattice might be considered. Best photocatalytic performances were attained for the samples with Y³⁺ content of 3.0 at. % for which the MB degradation rate constant appears 2-fold higher. Furthermore, photoactivities for visible-light-driven O₂ evolution demonstrate that the photocatalytic performance of the best Y-doped system (initial rate of O₂ evolution, 285 渭mol g^鈥? h^鈥?) was more than 5 times that of undoped m-BiVO₄ (initial rate of O₂ evolution, 53 渭mol g^鈥? h^鈥?). The occurrence of Y³⁺ doping and a monoclinic鈥搕etragonal heterostructured BiVO₄ system induces the higher photocatalytic activities. PL analysis provides a clear evidence of the lower charge carriers recombination in heterostructured yttrium-doped systems.