期刊
APPLIED SURFACE SCIENCE
卷 478, 期 -, 页码 334-340出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.01.238
关键词
Photocatalytic water splitting; Sr2Ta2O7; g-C3N4; Nanocomposite
类别
资金
- National Natural Science Foundation of China [11674398]
- fund of the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals [SKL-SPM-201808]
Visible light-driven photocatalytic hydrogen production has been deemed a potential means to solve the increasingly serious energy shortage problem. Herein, two dimensional (2D) Sr2Ta2O7/S-doped g-C3N4 nanocomposites that applied in photocatalytic water reduction were fabricated through thermal condensation of thiourea with hydrothermal-prepared Sr2Ta2O7. The resulted Sr2Ta2O7/S-doped g-C3N4 nanocomposite exhibited enhanced hydrogen evolution rate (11.36 mu mol g(-1) h(-1)) under visible light irradiation, which is about 3.5 times higher than that of pure S-doped g-C3N4. In light of the UV-vis diffuse reflectance spectroscopy, Mott-Schottky curve and photoluminescence spectra, the enhanced photocatalytic performance could be mainly attributed to the conduction band difference between Sr2Ta2O7 and S-doped g-C3N4. In addition, transient photoluminescence spectra, electrochemical impedance spectra and photocurrent responses proved that the presence of Pt cocatalyst also plays an important role in facilitates the transport of photoexcited electron-hole pairs, subsequently promoting the photocatalytic performance.
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