Construction and Photocatalytic Performance of Quantum Dots Self-decorated TiO2 p-n Homojunction†

doi:10.7503/cjcu20200107

Abstract

Abstract:

Quantum dots(QDs) self-decorated TiO₂ p-n homojunction(PNT-x) samples were fabricated by in-situ depositing p-type TiO₂ QDs on the surface of n-type TiO₂ nanosheets. The composition and structure of the samples were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), photoluminescence spectrometry(PL), Raman spectrometry, UV visible diffuse reflectance spectrometry(UV-Vis DRS), photoelectrochemical test and electrochemical impedance spectroscopy(EIS) analyses. The results indicate that PNT-x exhibits TiO₂ QDs self-decorated structure. Meanwhile, there exist metal and oxygen vacancies in QDs and nanosheets, respectively, and the content of vacancies can be modulated by the composition. Therefore, the as-prepared PNT-x show typical characteristics of p-n homojunction, and the difference of Fermi level and internal electrical field is stronger than that in n-n type Ⅱ homojunction and bulk p-n homojunction, thus leading to a significantly high charge separation and transfer efficiency. Under illumination, the order of photocatalytic activity is PNT-400>p-25>PNT-600>PNT-200>p-TiO₂>n-TiO₂, and PNT-400 display the photocatalytic hydrogen evolution rate as high as 41.7 mmol·g^-1·h^-1, which is 4.3, 3.6 and 2.3 times that of n-TiO₂ nanosheets, type Ⅱ homojunction and bulk p-n homojunction, respectively, as well as a good catalytic stability.

Key words: TiO₂, p-n Homojunction, Defect modulation, Charge separation, Photocatalytic H₂ evolution

CLC Number:

O643.3

TrendMD:

WANG Feifan, WANG Songbo, YAO Keyi, ZHANG Lei, DU Wei, CHENG Penggao, ZHANG Jianping, TANG Na. Construction and Photocatalytic Performance of Quantum Dots Self-decorated TiO₂ p-n Homojunction^†[J]. Chem. J. Chinese Universities, 2020, 41(7): 1615.

Figures/Tables 11

References 43

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Construction and Photocatalytic Performance of Quantum Dots Self-decorated TiO₂ p-n Homojunction^†

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