Photo-thermal Coupling Water Splitting over Fe-doped TiO2 with Various Nanostructures

doi:10.7503/cjcu20200886

Abstract

Abstract:

Oxygen vacancy（V_O） is an important part of the defect engineering. The direct thermal application of reductive photo-induced V_O has been regarded as an effective way for solar utilization in the field of hydrogen production from pure water splitting. Based on TiO₂ nanomaterials synthesized by various preparation me-thods， the performance of pure water splitting in photo-thermal coupling was tested on a variety of topography TiO₂ samples and its promoted form with Fe ions doping. The high resolution transmission electron microscopy（HRTEM）， X-ray diffraction（XRD） and electron paramagnetic resonance（EPR） were utilized for the observation of crystal characteristics. The diffuse reflectance spectroscopy（DRS）， photoluminescence（PL） and electrochemical characterization were applied to compare the materials properties. Moreover， the whole water splitting reaction pathway was performed via density functional theory（DFT）. Compared with hydrothermal nanosheets and nanowires， the nanoparticles prepared by sol-gel own abundant defects， resulting in a decline in hydrogen yield. To increase the photo-induced V_O generation during the photo reaction， which takes the highest energy barriers， the Fe doping was introduced into the nanomaterials， with the advantages of extended photoresponse， enhanced electron-hole pairs separation， prolonged carriers lifetime and decreased impe-dance. Meanwhile， defects in nanomaterials promote effective doping of Fe atoms， the average hydrogen yield on Fe-doped TiO₂ nanoparticles is 9.73 μmol/g in photo-thermal coupling reaction， which is almost 13 times to the bare TiO₂. The comparison and modification of nano TiO₂ with various morphologies provide a new approach for the solar functional materials.

Key words: Oxygen vacancy, Photo-thermal coupling, Nanostructure TiO₂, Fe-doped TiO₂, Hydrogen production

CLC Number:

O644.1

TrendMD:

WU Qiliang, MEI Jinghao, LI Zheng, FAN Haidong, ZHANG Yanwei. Photo-thermal Coupling Water Splitting over Fe-doped TiO₂ with Various Nanostructures[J]. Chem. J. Chinese Universities, 2021, 42(6): 1837.

Figures/Tables 10

References 27

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Photo-thermal Coupling Water Splitting over Fe-doped TiO₂ with Various Nanostructures

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