Synthesis by Functional-Template Induced Methodology and Photoelectrochemical Performance of Mesoporous Tungsten Trioxide

Abstract

Abstract: Mesoporous tungsten trioxide (DDA-WO₃) was prepared using tungstic acid (H₂WO₄) as a tungsten precursor, dodecylamine (DDA) as a surfactant template which has structure guiding function. The specific surface area (57.3 m²·g^-1) of DDA-WO₃ was 2.35 times of 24.5 m²·g^-1for WO₃ (H₂WO₄-WO₃) prepared without DDA. X-ray diffraction (XRD) result of the DDA-WO₃ calcined at 400 ℃ indicates that a crystalline framework with disordered arrangement of pores. The crystallinity of DDA-WO₃ calcined at 400~550 ℃ is higher than each of H₂WO₄-WO₃. DDA-WO₃/FTO (SnO₂∶F) calcined at 400 ℃ generates photoanodic current density of 0.18 mA·cm^-2 at 1.0 V versus Ag/AgCl, which is about 3 times higher than that of the H₂WO₄-WO₃/FTO(0.06 mA·cm^-2). The enhanced photoelectrochemical (PEC) performance of DDA-WO₃/FTO suggests that the higher specific surface area of mesoporous structure is a dominant factor for the PEC performance rather than insufficient crystallinity. DDA-WO₃/FTO calcined at 500 ℃ still exhibites excellent PEC performance than H₂WO₄-WO₃/FTO due to higher crystallinity, although the degradation of the mesostructure at higher temperature.

Key words: mesoporous structure, template, WO₃, photoanode, phototelectrochemical performance

CLC Number:

LI Dong, GAO Caiyun. Synthesis by Functional-Template Induced Methodology and Photoelectrochemical Performance of Mesoporous Tungsten Trioxide[J]. Journal of Synthetic Crystals, 2020, 49(12): 2350-2357.

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