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Shape-controllable synthesis of GdVO4 photocatalysts and their tunable properties in photocatalytic hydrogen generation

Abstract

Novel visible light responsive materials for water splitting are essential for efficient conversion of solar energy into hydrogen bond energy. Among other semiconductors, gadolinium orthovanadate, has appropriate conduction and valence edges position to split water molecules, as well as, has narrow band gap allowing to use visible light to generate hydrogen. Thus, we present here that hydrogen evolution under visible light (λ > 420 nm) could be accomplished using a hierarchical 3D GdVO4 particles, obtained by a simple, one pot hydrothermal synthesis. We found that applying various reaction components, such as EDTA-Na2 and EDTA, and adjusting the pH of the solution, allows to tune shape of GdVO4, (such as: short nanowires, long nanowires, short nanorods, long nanorods, nanoparticles and spheres - all having the tetragonal crystal structure), as well as optical and photocatalytic properties. The highest ability to photocatalytically split methanol solution into hydrogen under UV-Vis irradiation had the long nanowires sample (42 µmol/h), having almost 11 times higher efficiency in comparison with the weakest sample – short nanowires. In addition, GdVO4 spheres generated more than 2 times H2 (5.75 µmol/h) in comparison with short nanorods sample (2.5 µmol/h) under visible light excitation. Photostable in three-hour work cycles long nanowires and spheres were even able to generate hydrogen from pure water, reaching the value 17 and 3 µmol under UV-Vis and Vis light, respectively.

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Publication details

The article was received on 23 Oct 2018, accepted on 03 Dec 2018 and first published on 03 Dec 2018


Article type: Paper
DOI: 10.1039/C8DT04225J
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Shape-controllable synthesis of GdVO4 photocatalysts and their tunable properties in photocatalytic hydrogen generation

    P. Mazierski, J. Sowik, M. Miodynska, G. Trykowski, A. Mikolajczyk, T. Klimczuk, W. Lisowski, J. Nadolna and A. Zaleska-Medynska, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT04225J

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