Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 15, Pages 7705-7712Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.03.102
Keywords
Band gap structure; Hydrogen production; Visible light; Density functional theory
Categories
Funding
- National Nature Science Foundation of China [51178412, 51278456]
- National Key Technologies R&D Program of China [2013BAC16B01]
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(AgNbO3)(1-x)(SrTiO3)(x) samples were successfully employed as photocatalysts for photocatalytic hydrogen evolution under visible light. The samples were characterized by a series of techniques, including X-ray diffractometry, scanning electron microscopy, UV-Vis spectrophotometry, and electrochemistry technology. The band gaps of (AgNbO3)(1-x)(SrTiO3) solid solutions can be tuned continuously from 3.21 to 2.65 eV and the flat-band potentials (V-fb) can be shifted positively from -0.79 to -0.31 V vs. SHE when x decreased from 1 to 0. Band positions of (AgNbO3)(1-x)(SrTiO3)(x) samples were further testified by density functional theory, suggesting that the band gap narrowing of the solid solutions derived from the hybridization of (Ti 3d and Nb 4d) and (O 2p and Ag 4d) orbital. The photocatalytic activities of samples for H-2 evolution with Pt cocatalyst were evaluated in aqueous methanol solution under visible light irradiation. The highest photocatalytic activity was obtained at (AgNbO3)(0.25)(SrTiO3)(0.75). Photocatalytic activity in hydrogen evolution of these solid solutions proved to be closely dependent on band structures. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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