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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wang, Baoyi Cao, Xingzhong Tian, Lei Wei, Min Zhao, Yufei Su, Dang Sheng Chen, Pengyun Zhang, Shitong Duan, Xue Lu, Jun Evans, David G. Li, Zhuoxin Zhang, Bingsen |
| Description | Author Affiliation: Zhao Y ( State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing, PR China.) |
| Abstract | A family of photocatalysts for water splitting into hydrogen was prepared by distributing $TiO_{6}$ units in an MTi-layered double hydroxide matrix (M=Ni, Zn, Mg) that displays largely enhanced photocatalytic activity with an $H_{2}-production$ rate of $31.4 μmol h^{−1}$ 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 $TiO_{6}$ octahedra in the layered doubled hydroxide (LDH) matrix was obtained by the formation of an $M^{2+}-O-Ti$ network, rather different from the aggregation state of $TiO_{6}$ in the inorganic layered material $K_{2}Ti_{4}O_{9}.$ Both transient absorption and photoluminescence spectra demonstrate that the electron–hole 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 $TiO_{6}$ units was modified by the adjacent $MO_{6}$ 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 $TiO_{6}$ 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. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 38 |
| Volume Number | 18 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2012-09-17 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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