| Autor: |
Yang, Jing, Wang, Juan, Wang, Guohong, Wang, Kai, Li, Jinmao, Zhao, Li |
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| Zdroj: |
Journal of Materials Science & Technology; Aug2024, Vol. 189, p86-95, 10p |
| Abstrakt: |
• The TiO 2 /Bi 2 S 3 S-scheme heterojunction is prepared by hydrothermal method. • The TiO 2 /Bi 2 S 3 hybrid showed wide spectrum response and good photothermal effect. • An improved CO 2 photoreduction performance was achieved by the hybrid. • DFT calculation and in-situ characterization were used to clarify the mechanism. The combination of S-scheme heterojunction and photothermal effect is a promising strategy to achieve efficient CO 2 photoreduction into solar fuel due to the boosted charge carrier separation efficiency and faster surface reaction rate. Herein, unique photothermal-coupled TiO 2 /Bi 2 S 3 S-scheme heterojunction nanofibers were fabricated and applied to a full-spectrum CO 2 photoreduction system. Density functional theory calculation and experimental analyses have confirmed the generation of the internal electric field and the S-scheme electron transfer pathway, leading to a highly efficient charge carrier separation. Thanks to the excellent photothermal conversion capacity of Bi 2 S 3 , the photogenerated electron transfer rate, and surface reaction rate were further accelerated in hybrid photocatalysts. Under the synergistic effect of S-scheme heterojunction and photothermal effects, the optimal TiO 2 /Bi 2 S 3 nanofibers achieved 7.65 μmol h–1 of CH 4 production rate, which is 5.24 times higher than that of pristine TiO 2. Moreover, the morphology reconstruction of Bi 2 S 3 in hybrids facilitates the CH 4 selectivity was significantly improved from 64.2% to 88.7%. Meanwhile, the CO 2 photoreduction reaction route over TiO 2 /Bi 2 S 3 nanofibers was investigated based on in-situ Fourier transform infrared spectra. This work provides some useful hints for designing highly efficient photothermal-coupled photocatalysts for CO 2 photoreduction. [Display omitted] [ABSTRACT FROM AUTHOR] |
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