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Morphology-controlled synthesis of WO2.72 nanostructures and their photocatalytic properties

机译：形态学控制的WO2.72纳米结构合成及其光催化性能

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The morphologies of nanomaterials have great influence on their properties. In this work, we used the solvothermal method to prepare tungsten oxides with two different morphologies: WO _(2.72) nanowires and urchin-like WO _(2.72) nanostructures. The photocatalytic activities of these two bare WO _(2.72) nanostuctures were evaluated by their efficiency in the degradation of pollutants, during which the influence of the morphology was taken into account. In the experiments, material structures and oxygen vacancies were altered with the change of the morphology. One-dimensional WO _(2.72) nanowires with fewer oxygen vacancies showed higher photocatalytic activity than three-dimensional urchin-like WO _(2.72) nanostructures with more oxygen vacancies. Thus, we ascertained the prominent role of the structure, rather than the number of oxygen vacancies, in enhancing photocatalytic activity. Surface photocurrent (SPC) measurements further confirmed that WO _(2.72) nanowires were more conducive to photo electron transfer than urchin-like WO _(2.72) nanostructures, which corresponded with the results of photocatalysis. Compared with commercial nanostructured tungsten oxide, both the WO _(2.72) nanowires and urchin-like WO _(2.72) nanostructures exhibited enhanced photocatalytic activities for the degradation of pollutants under UV light irradiation.
机译：纳米材料的形态对其性质产生了很大的影响。在这项工作中，我们利用溶剂热法制备钨氧化物，两种不同的形态：WO _（2.72）纳米线和核苷酸样WO _（2.72）纳米结构。通过其在污染物的降解中的效率下评估这两个裸WO_（2.72）纳米型纳米型的光催化活性，在此期间考虑了形态的影响。在实验中，随着形态的变化改变了材料结构和氧空位。具有较少氧空位的一维WO _（2.72）纳米线显示比具有更多氧空位的三维核苷酸样WO _（2.72）纳米结构比三维核苷酸样活性更高。因此，我们在增强光催化活性方面确定了结构的突出作用，而不是氧空位的数量。表面光电流（SPC）测量进一步证实，WO _（2.72）纳米线更有利于光电样WO _（2.72）纳米结构，其与光催化的结果相对应。与商业纳米结构氧化钨相比，WO _（2.72）纳米线和核苷酸样WO _（2.72）纳米结构表现出增强的光催化活性，用于在UV光照射下污染物的降解。

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