Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 17, Issue 28, Pages 7858-7867Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201003755
Keywords
chromium; crystal growth; energy conversion; hydrothermal synthesis; photochemistry
Categories
Funding
- National Natural Science Foundation of China (NSFC) [50821064, 91010012]
- National Basic Research Program of China (973 Program) [2009CB220000]
- China Scholarship Council (CSC)
- International Joint Graduate School (IJGS)
- NIMS
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Cubic perovskite structure photocatalysts of Na0.5La0.5TiO3 and (Na0.5La0.5TiO3)(1.00)(LaCrO3)(0.08) solid solution that consisted of well-defined single-crystal nanocubes were successfully prepared by means of facile and surfactant-free hydrothermal reactions for the first time. The results from different instrumental characterizations and theoretical calculations consistently confirmed the formation of nanocubic single-crystal solid solution of (Na0.5La0.5TiO3)(1.00)(LaCrO3)(0.08), and clearly revealed the modification of its physicochemical properties compared with those of Na0.5La0.5TiO3. In particular, the effective narrowing of the bandgap (from 3.19 to 2.25 eV) by Cr3+ in the solid solution made it possible to utilize visible light. The solid-solution configuration maintained the charge balance to preserve the valence of Cr3+ rather than Cr6+, and accommodated Cr3+ with high content to form new energy bands instead of localized impurity levels. The hydrothermal preparation strategy ensured the formation of single crystals with high purity, few defects, and regulated morphology; it also guaranteed the valences of Ti4+ and Cr3+ in the solid solution. Consequently, the recombination of photogenerated carriers could be effectively suppressed to benefit photocatalytic H-2 evolution. (Na0.5La0.5TiO3)(1.00)(LaCrO3)(0.08) nanocubic single-crystal solid solution showed stable photocatalytic activity, and thus was proved to be a promising candidate for visible-lightdriven photocatalytic H-2 evolution.
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