期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 42, 页码 23658-23668出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.07.078
关键词
Overall water splitting; g-C3N4/BiFeO3; Heterojunction; Hydrogen generation; Z-scheme
Solar water splitting by photocatalysis in the absence of sacrificial agent has been identified as a promising approach to produce green hydrogen. Increasing photocatalytic efficiency is the core issue in this process. Forming heterojunctions is one potential solution to improve photoactivity. Herein, we successfully synthesized several g-C3N4/BiFeO3 composites containing different mass ratio of g-C3N4 by an uncomplicated and cost-effective method. The composite samples exhibited remarkably enhanced photocatalytic performance compared with the bare BiFeO3 and g-C3N4. The highest hydrogen production rate obtained is similar to 160.75 mu mol h(-1) .g(-1) under UV irradiation and similar to 23.31 mu mol h(-1).g(-1) under visible light irradiation. This enhanced photocatalytic activity is attributed to the synergistic effect of the junction and Z-scheme charge transfer mechanism between BiFeO3 and g-C3N4 , which can effectively accelerate the separation of photogenerated electron-hole pairs and also capability of carrying out redox reaction. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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