刘宇飞, 杨玉蓉, 孙政新, 刘畅, 邱敏, 高帆. 氧空位调控BiVO4纳米片的制备及光解水制氧性能[J]. 华南师范大学学报(自然科学版), 2022, 54(3): 22-27. doi: 10.6054/j.jscnun.2022039
引用本文: 刘宇飞, 杨玉蓉, 孙政新, 刘畅, 邱敏, 高帆. 氧空位调控BiVO4纳米片的制备及光解水制氧性能[J]. 华南师范大学学报(自然科学版), 2022, 54(3): 22-27. doi: 10.6054/j.jscnun.2022039
LIU Yufei, YANG Yurong, SUN Zhengxin, LIU Chang, QIU Min, GAO Fan. The Synthesis of Oxygen Vacancy-mediated BiVO4 Nanosheets and Their Performance in Photocatalytic Water Splitting O2 Evolution[J]. Journal of South China Normal University (Natural Science Edition), 2022, 54(3): 22-27. doi: 10.6054/j.jscnun.2022039
Citation: LIU Yufei, YANG Yurong, SUN Zhengxin, LIU Chang, QIU Min, GAO Fan. The Synthesis of Oxygen Vacancy-mediated BiVO4 Nanosheets and Their Performance in Photocatalytic Water Splitting O2 Evolution[J]. Journal of South China Normal University (Natural Science Edition), 2022, 54(3): 22-27. doi: 10.6054/j.jscnun.2022039

氧空位调控BiVO4纳米片的制备及光解水制氧性能

The Synthesis of Oxygen Vacancy-mediated BiVO4 Nanosheets and Their Performance in Photocatalytic Water Splitting O2 Evolution

  • 摘要: 采用水热和烧结方法制备了氧空位调控的BiVO4纳米片。通过X射线衍射仪、电子自旋共振谱仪、透射电子显微镜、紫外-可见分光光度计、荧光光谱仪和光解水制氧系统研究了不同氧空位含量(OV)BiVO4纳米片的结构和光解水制氧性能。通过对氧空位含量的调控,实现了对BiVO4纳米片的光吸收和光电性能的优化,极大提高了BiVO4纳米片的光解水制氧效率。结果表明:引入氧空位后,BiVO4纳米片在可见光区的光吸收明显增强,并且随着氧空位含量的增加,样品的吸收边发生明显红移。适量氧空穴的引入显著提高了光生电子和空穴的分离,从而提高光生电子的利用率。BiVO4-OV2纳米片的光催化产氧速率约433 μmol/(h·g),约为BiVO4纳米片的10倍。

     

    Abstract: Oxygen vacancy-mediated BiVO4 nanosheets were synthesized with the hydrothermal and sintering methods. The structure and hydrogen production properties of BiVO4 nanosheets with different oxygen vacancy (OV) contents were studied with X-ray diffractometer(XRD), electron spin resonance spectroscopy, high resolution transmission electron microscope, UV-Vis spectrophotometer, fluorescence spectrometer and the photocatalytic O2 evolution system. Through the regulation of Ov content, the optical absorption and optoelectronic properties of BiVO4 nanosheets were optimized, and the photocatalytic O2 production efficiency was greatly improved. The results showed that the optical absorption of BiVO4 nanosheets in the visible region was significantly enhanced after OV introduction, and the absorption edge of the sample is obviously red-shifted with the increase of OV content. The introduction of an appropriate OV amount could significantly improve the separation of photogenerated electrons and holes, thus improving the utilization rate of photogenerated electrons. The photocatalytic O2 production rate of BiVO4-OV2 nanosheets was about 433 μmol/(h·g), which was about 10 times higher than that of BiVO4.

     

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