TY - JOUR
T1 - Decoration of Bi2Se3 nanosheets with a thin Bi2SeO2 layer for visible-light-driven overall water splitting
AU - Wang, Xiaoyang
AU - Yang, Xu
AU - Miao, Lei
AU - Gao, Jie
AU - Wu, Liangpeng
AU - Wang, Nan
AU - Li, Xinjun
N1 - Funding Information:
This work was supported by National Natural Science Foundation of China (Grant No. 51572049 , 51562005 , 51772056 , 51602068 ) and Guangxi Natural Science Foundation of China (Grant No. 2015GXNSFFA139002 ). The authors gratefully acknowledge the testing support of this work by the analytical and testing center of GIEC.
Publisher Copyright:
© 2018 Hydrogen Energy Publications LLC
PY - 2018/6/14
Y1 - 2018/6/14
N2 - Exploring and developing novel semiconductor photo-catalysts for visible-light-driven water splitting are of great scientific significance to solve energy and environmental problems. Herein, Bismuth Selenide (Bi2Se3) nanosheets decorated with a thin layer of Bi2SeO2 to form Bi2Se3/Bi2SeO2 nanocomposites were successfully prepared using a conventional reflux and heating method. Fabricated Bi2Se3/Bi2SeO2 heterojunctions were characterized via X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. It has revealed that, the thickness of outer Bi2SeO2 layer can be tuned upon the annealing temperatures, which strongly influenced the performance of catalyst towards water splitting performances. Annealed at 200 °C, the Bi2Se3/Bi2SeO2 heterojunction with ∼5 nm of Bi2SeO2 layer yielded the highest hydrogen production rate of 136 μmol g−1 h−1. This enhanced photo-catalytic activity was ascribed to the synergy effect between the Bi2Se3/Bi2SeO2 layer, increased the visible light absorbance capacity, adjustment of the band gap and accelerate the electron-hole separation efficiency. The results represent a simply solution-based method towards a material with high photo-catalytic performance through the appropriate regulation of the oxidation degree of Bi2Se3 nanosheets, promising their industrial applications.
AB - Exploring and developing novel semiconductor photo-catalysts for visible-light-driven water splitting are of great scientific significance to solve energy and environmental problems. Herein, Bismuth Selenide (Bi2Se3) nanosheets decorated with a thin layer of Bi2SeO2 to form Bi2Se3/Bi2SeO2 nanocomposites were successfully prepared using a conventional reflux and heating method. Fabricated Bi2Se3/Bi2SeO2 heterojunctions were characterized via X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. It has revealed that, the thickness of outer Bi2SeO2 layer can be tuned upon the annealing temperatures, which strongly influenced the performance of catalyst towards water splitting performances. Annealed at 200 °C, the Bi2Se3/Bi2SeO2 heterojunction with ∼5 nm of Bi2SeO2 layer yielded the highest hydrogen production rate of 136 μmol g−1 h−1. This enhanced photo-catalytic activity was ascribed to the synergy effect between the Bi2Se3/Bi2SeO2 layer, increased the visible light absorbance capacity, adjustment of the band gap and accelerate the electron-hole separation efficiency. The results represent a simply solution-based method towards a material with high photo-catalytic performance through the appropriate regulation of the oxidation degree of Bi2Se3 nanosheets, promising their industrial applications.
KW - BiSe
KW - BiSeO
KW - Hydrogen production
KW - Visible-light
KW - Water splitting
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U2 - 10.1016/j.ijhydene.2018.04.239
DO - 10.1016/j.ijhydene.2018.04.239
M3 - Article
AN - SCOPUS:85047368291
SN - 0360-3199
VL - 43
SP - 10950
EP - 10958
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 24
ER -