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Facile Coengineering of Oxygen Defects and Highly Active {110} Facets in TiO <sub/>2</sub> Nanorods for Efficient Water Splitting
摘要： Optimizing the photocatalytic activity of TiO2 for hydrogen evolution from water splitting remains a challenging task. Herein, we report the synthesis of a slightly oxygen-deficient TiO2 film consisting of anatase nanorods with mainly {110} lateral surfaces by a facile one-step technology of magnetron sputtering. The 1D nanostructure and Ti3+/oxygen vacancies in the as-prepared TiO2 film are advantageous for the inhibition of recombination of electron-hole pairs, while the exposed {110} lateral surfaces provide abundant surface active sites; as a result, this TiO2 exhibited an ultra-high photocatalytic activity for water splitting. Remarkably, photocatalytic overall water splitting into H2 and O2 simultaneously with a ratio close to 2:1 has been realized for the first time over pristine anatase TiO2 without the assistance of sacrificial electron donor and cocatalyst. Additionally, in the presence of methanol as a sacrificial agent, the pristine TiO2 displayed a high apparent quantum efficiency of ～21.4% at 365 nm and the hydrogen generation rate under the full-arc light irradiation could be as high as 14.35 mmol m-2 h-1, which is about three orders of magnitude higher than that of P25 film (~0.014 mmol m-2 h-1). This result provides a facile pathway to synthesizing defect-based metal oxide with optimal facets and morphology for high-efficiency energy conversion.
关键词： TiO2 nanorods,active facets,photocatalysis,oxygen defect,water splitting
更新于2025-09-19 17:15:36
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Size tunable Bi3O4Br hierarchical hollow spheres assembled with {0?0?1}-facets exposed nanosheets for robust photocatalysis against phenolic pollutants
摘要： Synthesis of three-dimensional (3D) hierarchical hollow spheres with exposed {0 0 1} active facets are of huge significance in the field of semiconductor photocatalysis. Herein, we demonstrate a facile ionic liquid-in-water (IL/W) microemulsion approach for the fabrication of Bi-rich Bi3O4Br hierarchical hollow spheres assembled with {0 0 1}-facets exposed nanosheets. The size and {0 0 1}-facets exposure ratio of Bi3O4Br hierarchical hollow spheres can be fine-tuned by adjusting the concentration of surfactant TX-100. A possible formation mechanism of Bi3O4Br hierarchical hollow spheres assembled with {0 0 1}-facets exposed nanosheets by microemulsion template and dissolution-recrystallization was proposed based on SEM and XRD results. The actual photocatalytic activity was extensively investigated by degrading multiform phenol derivatives with different substituents and substitution positions, including acetaminophen (APAP), 4-tert-butylphenol (PTBP), o-nitrophenol (ONP), methylparaben (MPB). The Bi3O4Br hierarchical hollow spheres assembled with {0 0 1}-facets exposed nanosheets not only exhibit significantly promoted visible-light photocatalytic activity, but also have robust and nonselective photooxidation ability. The photocurrent and impedance results indicated that significantly strengthened charge separation and transfer efficiency that derived from the advantages of Bi3O4Br {0 0 1} active facets and hollow structures were responsible for the high photo-activity. The study may provide some new hints on designing and developing novel 3D hierarchical hollow structures with exposing {0 0 1} active facets for heterogeneous photocatalysis.
关键词： Bi3O4Br,Photocatalysis,Phenolic pollutants,Hierarchical hollow spheres,Exposed {0 0 1} active facets
更新于2025-09-10 09:29:36