Architecture of Ordered Mesoporous Tungsten Oxide Using Surfactant as Templates for Photoelectrochemical Water Oxidation
LI Dong1,2,*, WU Fachao3, LI Rui1, GAO Caiyun3,*
1 School of Material Science and Engineering, North Minzu University, Yinchuan 750021, China 2 International Scientific & Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials, Yinchuan 750021, China 3 Chemical Science and Engineering College, North Minzu University, Yinchuan 750021, China
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.
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2022, Vol. 36 
