Highly Dispersed TiO6 Units in a Layered Double Hydroxide for Water?Splitting
文献类型：期刊论文
| 作者 | Y. F. Zhao ; P. Y. Chen ; B. S. Zhang ; D. S. Su ; S. T. Zhang ; L. Tian ; J. Lu ; Z. X. Li ; X. Z. Cao ; B. Y. Wang ; M. Wei ; D. G. Evans ; X. Duan |
| 刊名 | Chemistry-a European Journal
 |
| 出版日期 | 2012 |
| 卷号 | 18期号:38页码:11949-11958 |
| 关键词 | double hydroxides layered compounds photochemistry titanium water splitting visible-light irradiation transient absorption-spectroscopy photocatalytic activity hydrogen-production titanium-dioxide mesoporous silica calcium niobate co oxidation water nanoparticles |
| ISSN号 | 0947-6539 |
| 中文摘要 | A family of photocatalysts for water splitting into hydrogen was prepared by distributing TiO6 units in an MTi-layered double hydroxide matrix (M=Ni, Zn, Mg) that displays largely enhanced photocatalytic activity with an H2-production rate of 31.4 mu mol?h-1 as well as excellent recyclable performance. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) mapping and XPS measurement reveal that a high dispersion of TiO6 octahedra in the layered doubled hydroxide (LDH) matrix was obtained by the formation of an M2+-O-Ti network, rather different from the aggregation state of TiO6 in the inorganic layered material K2Ti4O9. Both transient absorption and photoluminescence spectra demonstrate that the electronhole recombination process was significantly depressed in the Ti-containing LDH materials relative to bulk Ti oxide, which is attributed to the abundant surface defects that serve as trapping sites for photogenerated electrons verified by positron annihilation and extended X-ray absorption fine structure (EXAFS) techniques. In addition, a theoretical study on the basis of DFT calculations demonstrates that the electronic structure of the TiO6 units was modified by the adjacent MO6 octahedron by means of covalent interactions, with a much decreased bandgap of 2.1 eV, which accounts for its superior water-splitting behavior. Therefore, the dispersion strategy for TiO6 units within a 2D inorganic matrix can be extended to fabricate other oxide or hydroxide catalysts with greatly enhanced performance in photocatalysis and energy conversion. |
| 原文出处 | |
| 公开日期 | 2013-02-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/60490]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | Y. F. Zhao,P. Y. Chen,B. S. Zhang,et al. Highly Dispersed TiO6 Units in a Layered Double Hydroxide for Water?Splitting[J]. Chemistry-a European Journal,2012,18(38):11949-11958. |
| APA | Y. F. Zhao.,P. Y. Chen.,B. S. Zhang.,D. S. Su.,S. T. Zhang.,...&X. Duan.(2012).Highly Dispersed TiO6 Units in a Layered Double Hydroxide for Water?Splitting.Chemistry-a European Journal,18(38),11949-11958. |
| MLA | Y. F. Zhao,et al."Highly Dispersed TiO6 Units in a Layered Double Hydroxide for Water?Splitting".Chemistry-a European Journal 18.38(2012):11949-11958. |
入库方式： OAI收割
来源：金属研究所
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