Ce(3+)-ion, Surface Oxygen Vacancy, and Visible Light-induced Photocatalytic Dye Degradation and Photocapacitive Performance of CeO(2)-Graphene Nanostructures.
Ce(3+)-ion, Surface Oxygen Vacancy, and Visible Light-induced Photocatalytic Dye Degradation and Photocapacitive Performance of CeO(2)-Graphene Nanostructures.
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DOI：
10.1038/s41598-017-06139-6
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发表时间：
2017-07-19
影响因子：
4.6
通讯作者：
Cho MH
中科院分区：
文献类型：
--
作者：
Khan ME;Khan MM;Cho MH
氧化铈纳米颗粒（CeO 2 NPs）的制造和石墨烯片上使用一个简单的，低成本的水热方法生长，随后使用不同的标准表征技术进行了表征。X射线光电子能谱和电子顺磁共振揭示了表面状态的变化，组成，Ce 4+与Ce 3+比例的变化，以及其他缺陷。透射电子显微镜（TEM）和高分辨率TEM显示所制备的CeO 2纳米颗粒为球形，粒径约为10-12 nm。CeO 2纳米颗粒中的缺陷与最佳量的二维石墨烯片的组合对所得混合CeO 2-石墨烯纳米结构的性质具有显著影响，例如改善的光学、光催化和光电电容性能。在可见光照射下，它们对刚果红和亚甲基蓝的降解率分别为94.5%和98%，表明它们具有良好的光催化降解性能。光电极性能的最大光电容为177.54 Fg-1，并表现出规则的电容行为。因此，Ce 3+离子、表面氧空位和缺陷诱导的行为可以归因于由于CeO 2纳米颗粒和石墨烯片之间的快速电荷转移而导致的光生电子-空穴对的复合的抑制。这些发现将对CeO 2-石墨烯纳米结构在未来能源和环境相关应用中的应用产生深远的影响。
Cerium oxide nanoparticles (CeO2 NPs) were fabricated and grown on graphene sheets using a facile, low cost hydrothermal approach and subsequently characterized using different standard characterization techniques. X-ray photoelectron spectroscopy and electron paramagnetic resonance revealed the changes in surface states, composition, changes in Ce4+ to Ce3+ ratio, and other defects. Transmission electron microscopy (TEM) and high resolution TEM revealed that the fabricated CeO2 NPs to be spherical with particle size of ~10–12 nm. Combination of defects in CeO2 NPs with optimal amount of two-dimensional graphene sheets had a significant effect on the properties of the resulting hybrid CeO2-Graphene nanostructures, such as improved optical, photocatalytic, and photocapacitive performance. The excellent photocatalytic degradation performances were examined by monitoring their ability to degrade Congo red ~94.5% and methylene blue dye ~98% under visible light irradiation. The photoelectrode performance had a maximum photocapacitance of 177.54 Fg−1 and exhibited regular capacitive behavior. Therefore, the Ce3+-ion, surface-oxygen-vacancies, and defects-induced behavior can be attributed to the suppression of the recombination of photo-generated electron–hole pairs due to the rapid charge transfer between the CeO2 NPs and graphene sheets. These findings will have a profound effect on the use of CeO2-Graphene nanostructures for future energy and environment-related applications.
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