Abstract
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 ~ 160.75 μmol h−1.g-1 under UV irradiation and ~23.31 μmol 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.
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