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A stable and highly efficient visible-light photocatalyst of TiO2 and heterogeneous carbon core–shell nanofibers

机译：稳定且高效的TiO 2 和非均质碳核-壳纳米纤维的可见光催化剂

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A novel core–shell heterostructure of TiO2 nanofibers with carbon quantum dots embedded in an amorphous carbon shell has been successfully prepared via a simple electrospinning and impregnation process. Here, carbon quantum dots (CQDs) are designed as sensitizers for the visible-light response and amorphous carbon ensures intimate contact with TiO2. The photocatalytic performance is evaluated by the degradation of rhodamine-B under visible light irradiation. It is found that the composite nanofibers with an appropriate thickness of carbon shell exhibit a stable and highly efficient photocatalytic activity, and the apparent quantum efficiency can reach as high as 52%, which is about 10 times that of pure TiO2 nanofibers. Structural analyses show that the enhanced photocatalytic activity is attributed to the synergistic effect of TiO2, the amorphous carbon thin shell and the CQDs embedded inside. Due to the intimate contact between TiO2 and the carbon shell, the photogenerated electrons can be easily transferred from the CQDs to TiO2 resulting in a longer lifetime of the photogenerated electron–hole pairs and a higher photocatalytic activity. In addition, the unique upconversion properties of the CQDs enables the nanofibers to utilize more solar energy and increase the photocatalytic activity. Also, the carbon shell can induce more oxygen vacancies on the surface of the nanofibers, which can further enhance the photocatalytic activity. The results in this work may be beneficial to the future study of exploring new carbon-based heterostructured materials for visible-light-driven photocatalysts.
机译：通过简单的电纺丝法和电沉积法成功地制备了一种新型的TiO 2 纳米纤维的核-壳异质结构，其中碳量子点嵌入非晶碳壳中。浸渍过程。在这里，碳量子点（CQD）被设计为用于可见光响应的敏化剂，而无定形碳可确保与TiO 2 紧密接触。通过若丹明-B在可见光照射下的降解来评价光催化性能。发现具有适当厚度的碳壳的复合纳米纤维表现出稳定且高效的光催化活性，表观量子效率可高达52％，约为纯TiO 的10倍。 > 2 纳米纤维。结构分析表明，增强的光催化活性归因于TiO 2 ，非晶碳薄壳和嵌入其中的CQD的协同作用。由于TiO 2 与碳壳之间的紧密接触，光生电子可以很容易地从CQD转移到TiO 2 导致更长的光生电子-空穴对寿命和更高的光催化活性。此外，CQD独特的上转换特性使纳米纤维能够利用更多的太阳能并提高光催化活性。而且，碳壳可以在纳米纤维的表面上引起更多的氧空位，这可以进一步增强光催化活性。这项工作的结果可能对探索新型碳基异质结构材料用于可见光驱动的光催化剂的未来研究有益。

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