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首页> 外文期刊>Materials Science and Engineering >Optical, electrical and visible light-photocatalytic properties of yttrium-substituted BiVO_4 nanoparticles
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Optical, electrical and visible light-photocatalytic properties of yttrium-substituted BiVO_4 nanoparticles

机译：钇取代的BiVO_4纳米粒子的光，电和可见光光催化性能

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摘要

Yttrium-substituted (11.3 and 30.7 at.%) BiVO_4 and pristine BiVO_4 nanoparticles were synthesized by hydrothermal method. They were characterized by high resolution scanning electron, field emission scanning electron, transmission electron and high resolution transmission electron microscopies, powder X-ray diffraction, and energy dispersive X-ray, Raman, UV-vis diffuse reflectance, photoluminescence and solid state impedance spectroscopies. Y-substitution favors transformation of monoclinic phase of BiVO_4 to tetragonal phase. High Y-substitution increases the crystallite size as well as the band gap energy and enhances charger carrier recombination. The charge transfer resistance of 11.3% Y-substituted BiVO_4 is much less than those of the others. The visible light photocatalytic activity of 11.3% Y-substituted BiVO_4 nanoparticles is larger than the rest. The larger photocatalytic activity of 11.3% Y-substituted BiVO_4 nanoparticles has been explained in terms of mean crystallite size, recombination of photoformed electron-hole pairs and charge transfer resistance.
机译：通过水热法合成了钇取代的（11.3和30.7 at。％）BiVO_4和原始BiVO_4纳米颗粒。它们的特征是高分辨率扫描电子，场发射扫描电子，透射电子和高分辨率透射电子显微镜，粉末X射线衍射和能量色散X射线，拉曼光谱，紫外可见漫反射，光致发光和固态阻抗光谱。 Y取代有利于BiVO_4的单斜晶相向四方晶相的转变。高Y取代度增加了微晶尺寸以及带隙能量，并增强了电荷载流子的复合。 11.3％Y取代的BiVO_4的电荷转移电阻远小于其他化合物。 11.3％Y取代的BiVO_4纳米粒子的可见光光催化活性大于其余的纳米粒子。 11.3％的Y-取代的BiVO_4纳米粒子具有更大的光催化活性，这是根据平均微晶尺寸，光形成的电子-空穴对的重组和电荷转移阻力来解释的。

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