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首页> 外文期刊>Applied Surface Science >Carbon quantum dots/TiO_2 nanosheets with dominant (001) facets for enhanced photocatalytic hydrogen evolution
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Carbon quantum dots/TiO_2 nanosheets with dominant (001) facets for enhanced photocatalytic hydrogen evolution

机译：碳量子点/ TiO_2纳米片，具有显性（001）刻面，用于增强的光催化氢气进化

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摘要

Carbon quantum dots/TiO2 nanosheets with a majority of (001) facet (CQDs/TiO2-001) samples are successfully prepared via a facile method. Compared to TiO2-001 and CQDs/P25, the synthesized CQDs/TiO2-001 presents a remarkably higher photocatalytic activity for H-2 evolution with a considerable stability. XRD, XPS, HRTEM, FESEM, FTIR, Photoluminescence (PL) spectroscopy, Fluorescence spectroscopy and UV-visible reflectance spectroscopy are adopted to investigate the morphology, structure and properties of synthesized CQDs/TiO2-001. The mechanism of the improved photocatalytic activity over CQDs/TiO2-001 is also investigated. The results show that the improved photocatalytic activity over CQDs/TiO2-001 can be attributed to the synergistic effects of TiO2-001 and CQDs: the highly exposed (001) facets of TiO2-001 promote the transportation of photogenerated electrons and the loading of CQDs restrains the recombination of electrons-holes on (001) facets. Meanwhile, the visible-light absorption is extended because the CQDs serve as a photosensitizer and sensitize TiO2-001 through the newly formed Ti-O-C bond between the CQDs and TiO2-001.
机译：碳量子点/ TiO2纳米片具有大多数（001）刻面（CQDS / TiO 2 -001）样品通过容易方法成功制备。与TiO2-001和CQDS / P25相比，合成的CQDS / TiO 2 -001具有相当稳定性的H-2演化的显着较高的光催化活性。采用XRD，XPS，HRTEM，FESEM，FTIR，光致发光（PL）光谱，荧光光谱和UV可见光反射光谱，用于研究合成的CQDS / TiO2-001的形态，结构和性能。还研究了改进的光催化活性的机理，同样研究了CQDS / TiO2-001。结果表明，通过CQDS / TiO 2 -001的改善的光催化活性可归因于TiO2-001和CQDS的协同作用：TiO2-001的高度暴露（001）刻面促进了光生电子的运输和CQD的负载限制电子孔的重组（001）刻面。同时，可见光吸收延长，因为CQDS用作光敏剂，并通过CQDS和TiO 2 -001之间的新形成的Ti-O-C键对TiO 2 -001感发。

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