期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 42, 页码 16562-16568出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta06648h
关键词
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资金
- National Natural Science Foundation of China [21474078, 51521001, 51002111]
- Natural Science Foundation of Hubei Province [2014CFB163, 2015CFA003]
- Top Talents Lead Cultivation Project of Hubei Province
- Yellow Crane Talent Plan of Wuhan Municipal Government
- Fundamental Research Funds for the Central Universities [WUT: 2014-IV-131]
This work has identified Ta2O5 {001} facets as the high-energy facet by first-principles theory, and demonstrated the first example of tantalum oxide facet engineering. Ta2O5 microcubic single crystals (MCSCs) with a large percentage exposure of highly active facets take advantage of the unique crystal structure and cubic morphology of the precursor tantalum oxychlorides, as well as the characteristics of a topological transformation synthesis. In our protocol, the heat treatment of the TaO2.18Cl0.64 microcube precursor only enables an intra-layer transition but preserves the {001} facets due to the strong 180 degrees Ta-O-Ta structure between layers. Consequently, mesoporous Ta2O5 MCSCs with highenergy facet exposure are produced. The as-obtained Ta2O5 MCSCs exhibit a remarkably enhanced photocatalytic hydrogen production activity for their specific surface area due to the enlarged percentage of exposed {001} facets, which possess the largest density and highest quality of hyperactive sites for the photocatalytic reaction. The results here may provide a plausible approach for both the facet engineering of metal oxides with similar layer structures and the enhancement of Ta2O5 chemical activities.
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