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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >In Situ Synthesis of V4+ and Ce3+ Self-Doped BiVO4/CeO2 Heterostructured Nanocomposites with High Surface Areas and Enhanced Visible-Light Photocatalytic Activity
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In Situ Synthesis of V4+ and Ce3+ Self-Doped BiVO4/CeO2 Heterostructured Nanocomposites with High Surface Areas and Enhanced Visible-Light Photocatalytic Activity

机译：原位合成具有高表面积和增强的可见光光催化活性的V4 +和Ce3 +自掺杂BiVO4 / CeO2异质结构纳米复合材料

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摘要

In order to achieve high performance in visible light photocatalysis, V4+ and Ce3+ self-doped BiVO4/CeO2 heterostructured nanocomposites with high surface areas were prepared using the templating approach employing mesoporous silica MCM-41 as the hard template. X-ray photoelectron spectroscopy (XPS) spectra have demonstrated the presence of plentiful V4+ and Ce3+ species in the nano composites accompanied by the formation of oxygen vacancies. The presence of V4+ species is further identified by the electron spin resonance (ESR) spectrum. Furthermore, the BiVO4 and CeO2 could be affecting each other by arousing the structural changes in the formed nanocomposites. The V4+ and Ce3+ self-doped 0.4BiVO(4)/0.6CeO(2) nanocomposite with the surface area as large as 78.35 m(2)/g exhibits the highest photocatalytic activity for the rhodamine B (RhB) and methyl orange (MO) degradation and photoelectrochemical performances. The enhanced photocatalytic mechanism is systematically studied via UV-vis diffuse reflectance spectra (DRS), photoluminescence (PL) spectra, transient photocurrent responses, and electrochemical impedance spectroscopy (EIS) spectra. The remarkable enhanced photocatalytic activity could be mainly attributed to the formed heterojunction nanostructures, the presence of defect states induced by oxygen vacancies, and self-doped V4+ and Ce3+ centers, as well as high surface areas. A possible photocatalytic mechanism over the V4+ and Ce3+ self-doped BiVO4/CeO2 nanocomposites is proposed based on the active species trapping experiments and calculated energy band structures.
机译：为了在可见光光催化下获得高性能，使用介孔二氧化硅MCM-41作为硬模板，采用模板法制备了具有高表面积的V4 +和Ce3 +自掺杂BiVO4 / CeO2异质结构纳米复合材料。 X射线光电子能谱（XPS）光谱表明，在纳米复合材料中存在大量V4 +和Ce3 +物种，同时形成了氧空位。通过电子自旋共振（ESR）光谱进一步确定了V4 +物种的存在。此外，BiVO4和CeO2可能会通过引起形成的纳米复合材料的结构变化而相互影响。 V4 +和Ce3 +自掺杂的0.4BiVO（4）/0.6CeO（2）纳米复合材料的表面积高达78.35 m（2）/ g，显示出对罗丹明B（RhB）和甲基橙（MO的最高光催化活性）降解和光电化学性能。通过紫外可见漫反射光谱（DRS），光致发光（PL）光谱，瞬态光电流响应和电化学阻抗光谱（EIS）光谱系统地研究了增强的光催化机理。显着增强的光催化活性可能主要归因于形成的异质结纳米结构，氧空位，自掺杂的V4 +和Ce3 +中心以及高表面积导致的缺陷态的存在。基于活性物种捕获实验和计算出的能带结构，提出了对V4 +和Ce3 +自掺杂BiVO4 / CeO2纳米复合材料的可能的光催化机理。

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