title: Complex-Mediated Synthesis of Tantalum Oxyfluoride Hierarchical Nanostructures for Highly Efficient Photocatalytic Hydrogen Evolution.
abstract: In this work, we have, for the first time, developed a facile wet-chemical route to obtain a novel photocatalytic material of tantalum oxyfluoride hierarchical nanostructures composed of amorphous cores and single crystalline TaO2F nanorod shells (ACHNs) by regulating the one-step hydrothermal process of TaF5 in a mixed solution of isopropanol (i-PrOH) and H2O. In this approach, elaborately controlling the reaction temperature and volume ratio of i-PrOH and H2O enabled TaF5 to transform into intermediate coordination complex ions of [TaOF3·2F](2-) and [TaF7](2-), which subsequently produced tantalum oxyfluoride ACHNs via a secondary nucleation and growth due to a stepwise change in hydrolysis rates of the two complex ions. Because of the unique chemical composition, crystal structure and micromorphology, the as-prepared tantalum oxyfluoride ACHNs show a more negative flat band potential, an accelerated charge transfer, and a remarkable surface area of 152.4 m(2) g(-1) contributing to increased surface reaction sites. As a result, they exhibit a photocatalytic activity for hydrogen production up to 1.95 mmol h(-1) g(-1) under the illumination of a simulated solar light without any assistance of co-catalysts, indicating that the as-prepared tantalum oxyfluoride ACHNs are a novel promising photocatalytic material for hydrogen production.
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, Wuhan, 430070, People's Republic of China.
authors.forename: Leilei
authors.initials: L
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, Wuhan, 430070, People's Republic of China.
authors.forename: Haotian
authors.initials: H
authors.lastname: Gong
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, Wuhan, 430070, People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, Wuhan, 430070, People's Republic of China.
authors.forename: Fei
authors.initials: F
authors.lastname: Long
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, Wuhan, 430070, People's Republic of China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Gu
authors.affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , 122 Luoshi Road, Wuhan, 430070, People's Republic of China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Guan
keywords: complex-mediated synthesis; core−shell particles; hierarchical structure; photocatalytic hydrogen production; stepwise hydrolysis; tantalum oxyfluoride