期刊
APPLIED SURFACE SCIENCE
卷 494, 期 -, 页码 886-894出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.07.227
关键词
Ag2S/Ag/Ag3VO4 ternary nanocomposites; Electron shuttle mediator; All solid state Z-scheme photocatalyst; H-2 evolution; Charge carrier separation
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1C1C1009482, 2018R1A2B6004746]
- National Research Foundation of Korea [2018R1A2B6004746, 2019R1C1C1009482] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Solar driven visible photocatalytic H-2 evolution using semiconductors is recognized as one of the most promising routes for clean energy technology; however, efficient visible light utilization and charge separation are the key roles in a photocatalyst system for high activity. Herein, Ag based ternary nanocomposite system, Ag2S/Ag/Ag3VO4 was synthesized by chemical reduction and subsequent hydrothermal methods. The prepared nanocomposites were characterized by Powder X-ray diffraction, X-ray photoelectron spectroscopy, Scanning and transmission electron microscopy, UV-vis diffuse reflectance and photoluminescence spectroscopy methods. The Ag2S/Ag/Ag3VO4 ternary nanocomposite system displayed a higher photocatalytic H-2 evolution activity than that of pure Ag3VO4, Ag2S and their binary composites under visible light irradiation. In the present work, Ag2S/Ag/Ag3VO4 exhibited a photocatalytic H-2 evolution activity of similar to 8.5 mmol.g(-1). The enhanced photocatalytic activity can be attributed to the improved visible light absorption and effective charge separation between Ag3VO4 and Ag2S via the electron shuttle mediator Ag.
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