Chemical Engineering Journal, volume 406, pages 126776
Enhanced electron–hole separation in SnS2/Au/g-C3N4 embedded structure for efficient CO2 photoreduction
Shikang Yin
1
,
Linlin Sun
1
,
Yaju Zhou
1
,
Xiaolin Li
1
,
Jinze Li
1
,
Xianghai Song
1
,
Pengwei Huo
1
,
王慧琴 Wang Huiqin
2
,
Yongsheng Yan
1
Publication type: Journal Article
Publication date: 2021-02-01
Journal:
Chemical Engineering Journal
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 15.1
ISSN: 13858947, 03009467
General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering
Environmental Chemistry
Abstract
Energy band location and charge separation mechanism of SnS 2 /Au/g-C 3 N 4 system during photoreduction under sunlight irradiation. • The catalyst is prepared by facile thermal treatment and chemical deposition method. • The SnS 2 /Au/g-C 3 N 4 composites show a superior optical adsorption under UV–vis light. • The Au nanoparticle and the Z-type scheme jointly improve the separation of carrier. • The SnS 2 /3ml-Au/g-C 3 N 4 displays the best photoreduction activity and durability. The use of semiconductor photocatalytic reduction technology has higher efficiency and lower energy consumption for CO 2 reduction, but its existence of some mismatched energy band positions and relatively slow charge-hole separation greatly limits its practical application. In this paper, a SnS 2 /Au/g-C 3 N 4 embedded structure model with carbon and nitrogen hybridization is proposed to gain an in-depth understanding of the role of hybridization and precious metal modification in photocatalysis. Carriers were investigated from the perspective of kinetics through photocurrent, LSV curve, and FL spectroscopy. After modification of Au nanoparticles, the photo-excited electrons showed a slower decay process, indicating that the separation of carriers was enhanced, which was further confirmed by impedance and PL spectroscopy. SEM, AFM and TEM analysis confirmed that the 2D face-to-face SnS 2 /Au/g-C 3 N 4 embedded structure was successfully prepared and the Au nanoparticles were evenly distributed. Au nanoparticles not only act as a bridge for electron transport in 2D semiconductor materials to accelerate electron transport, but generate more excited electrons by themselves under the radiation of sunlight, which effectively improves the separation efficiency of electron-hole pairs and enhances the photocatalyst activity. DFT calculations show that the Z-type mechanism and the intercalated energy level of the SnS 2 /Au/g-C 3 N 4 embedded structure expand the light absorption and improve the carrier separation efficiency. As expected, the photocatalyst activity with CO and CH 4 the evolution rate of up 93.81 µmol·g −1 ·h −1 and 74.98 µmol·g −1 ·h −1 under visible light irradiation, respectively, while the photocatalytic activity is negligible loss after 30 h photoreduction. This work reveals the role of embedded structure and precious metal modification in the separation and transmission of electron-hole, opening up new perspective for achieving high-efficiency solar CO 2 reduction performance.
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Yin S. et al. Enhanced electron–hole separation in SnS2/Au/g-C3N4 embedded structure for efficient CO2 photoreduction // Chemical Engineering Journal. 2021. Vol. 406. p. 126776.
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Yin S., Sun L., Zhou Y., Li X., Li J., Song X., Huo P., Wang Huiqin 王., Yan Y. Enhanced electron–hole separation in SnS2/Au/g-C3N4 embedded structure for efficient CO2 photoreduction // Chemical Engineering Journal. 2021. Vol. 406. p. 126776.
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TY - JOUR
DO - 10.1016/j.cej.2020.126776
UR - https://doi.org/10.1016/j.cej.2020.126776
TI - Enhanced electron–hole separation in SnS2/Au/g-C3N4 embedded structure for efficient CO2 photoreduction
T2 - Chemical Engineering Journal
AU - Yin, Shikang
AU - Sun, Linlin
AU - Zhou, Yaju
AU - Li, Xiaolin
AU - Li, Jinze
AU - Song, Xianghai
AU - Huo, Pengwei
AU - Wang Huiqin, 王慧琴
AU - Yan, Yongsheng
PY - 2021
DA - 2021/02/01 00:00:00
PB - Elsevier
SP - 126776
VL - 406
SN - 1385-8947
SN - 0300-9467
ER -
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@article{2021_Yin,
author = {Shikang Yin and Linlin Sun and Yaju Zhou and Xiaolin Li and Jinze Li and Xianghai Song and Pengwei Huo and 王慧琴 Wang Huiqin and Yongsheng Yan},
title = {Enhanced electron–hole separation in SnS2/Au/g-C3N4 embedded structure for efficient CO2 photoreduction},
journal = {Chemical Engineering Journal},
year = {2021},
volume = {406},
publisher = {Elsevier},
month = {feb},
url = {https://doi.org/10.1016/j.cej.2020.126776},
pages = {126776},
doi = {10.1016/j.cej.2020.126776}
}