表面活性剂模板法构筑有序介孔三氧化钨及其光电化学水氧化性能

doi:10.11896/cldb.21040241

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Abstract Ordered mesoporous WO₃ (m-WO₃) was prepared from peroxotungstic acid combined with evaporation-induced self-assembly technique, in which F127, a triblock copolymer, was used as template. The mesostructure, morphologies, porosity, spectral properties and composition of m-WO₃ were characterized by X-ray diffraction spectrometer (XRD), brunauer-emmett-teller (BET), transmission electron microscope (TEM), fourier transform infrared spectra (FTIR), Raman microspectroscopic (Raman) and field-emission scanning electron microscope (FESEM). The results confirm that m-WO₃ exhibites 2D hexagonal P6mm symmetric structure with the specific surface area of 105 m²/g, which is 21 times larger than that of non-porous WO₃ (5 m²/g), while the pore size distribution was more uniform (6.7 nm). XRD results show that the crystallinity of m-WO₃ samples is higher than that of WO₃ samples under the same calcination condition. The photoelectrochemical (PEC) results indicate that m-WO₃ calcined at 400 ℃ generates the photoanodic current density of 0.88 mA/cm² at 1.0 V versus Ag/AgCl, which is 3.3 times higher than that of WO₃ electrode (0.27 mA/cm²). It is attributed to the large surface area of m-WO₃, which can promote the separation of photogenerated electrons and holes efficiently, and thus significantly enhance the activity of m-WO₃. In addition, m-WO₃ exhibites more steady photocatalytic activity than non-porous WO₃. m-WO₃ still maintains superior catalytic activity due to its large specific surface area, despite the partial collapse of the mesostructure at high temperature. It was successful to solve the contradiction between crystallinity and specific surface area of mesoporous materials.

Key words： mesoporous structure soft template WO₃ phototelectrochemical water oxidation

Published: 10 July 2022 Online: 2022-07-12

CLC number:	O643
	TB383

Fund:Natural Science Foundation of Ningxia Province (2021AAC03170, 2019AAC03112) and the Key Research Project of North Minzu University(2019KJ02).

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	LI Dong
	WU Fachao
	LI Rui
	GAO Caiyun

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LI Dong,WU Fachao,LI Rui, et al. Architecture of Ordered Mesoporous Tungsten Oxide Using Surfactant as Templates for Photoelectrochemical Water Oxidation[J]. Materials Reports, 2022, 36(13): 21040241-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21040241 OR http://www.mater-rep.com/EN/Y2022/V36/I13/21040241

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