Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 186, Issue -, Pages 70-75Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.11.035
Keywords
Rietveld refinement; Bi incorporation; V-O bond; DFT calculation
Funding
- National Key Basic Research and Development Program [2003CB214500, 2009CB220000]
- National Natural Science Foundation of China [20973110]
- Global-Centre of Excellence in Novel Carbon Resource Sciences, Kyushu University, Japan
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Novel Bi0.5M0.5VO4 (BMV; M = La, Eu, Sm and Y) solid solutions were prepared and studied in this paper. All the samples were proved to produce H-2 and O-2 simultaneously from pure water under the irradiation of UV light. M-O bond lengths were proved to increase with M cations by refining cell parameters and atomic positions. Besides, band gaps, energy gaps and photocatalytic activities of BMV also changed with M cations. Both of M-O and V-O bond lengths were suggested to account for this phenomenon. Inactive A(0.5)Y(0.5)VO(4) (A = La, Ce) for water splitting proved incorporation of Bi rather than distortion of VO4 tetrahedron was a critical factor for improving efficiency of overall water splitting by facilitating the generation of electron and hole with lighter effective masses. Replacement of Bi by M cations not only gave indirect effect on band structure but also raised position of conduction band minimum to meet requirement Of H-2 production. (C) 2011 Elsevier Inc. All rights reserved.
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