Through hydrogen spillover to fabricate novel 3DOM-HxWO3/Pt/CdS Z-scheme heterojunctions for enhanced photocatalytic hydrogen evolution

• Published in: Applied catalysis. B, Environmental Environmental, 2019-11, Vol.256, p.117812, Article 117812
• Main Authors: Yan, Xiaoqing, Xu, Baorong, Yang, Xiaona, Wei, Jinjia, Yang, Bolun, Zhao, Lei, Yang, Guidong
• Format: Article
• Language: English
• Subjects: Catalysis; Heterojunctions; HxWO3; Hydrogen; Hydrogen evolution; Hydrogen production; Hydrogen spillover; Mass transfer; Photocatalysis; Photocatalytic H2 evolution; Quantum efficiency; Separation; Three-dimensionally ordered macroporous; Z-scheme heterojunction
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.117812

[Display omitted] •Novel 3DOM-HxWO3/Pt/CdS Z-scheme heterojunctions are synthesized.•The mass transfer and charge migration are enhanced.•The obtained sample shows excellent hydrogen production in Vis-NIR Region.•The Z-scheme mechanism of charge transfer is proposed. The use of hydrogen spillover is considered to be a promising strategy to prepare H containing photocatalyst for enhanced hydrogen evolution performance. In this work, we for the first time employ the hydrogen spillover assisted by in-situ hydrothermal method to successfully synthesize the novel 3DOM-HxWO3/Pt/CdS Z-scheme heterojunction. In this special photocatalytic system, three-dimensionally ordered macroporous (3DOM) structure provide a number of active sites for the mass transfer, and the Z-scheme architecture initiatively induce the electrons migration to achieve a high efficient charge separation. As a result, the as-prepared samples show a prominent apparent quantum efficiency (AQE) of 58.80% (420 nm) and excellent hydrogen production rate of 39.2 mmol g−1 h−1, which is 13.5 times as high as that of the pure CdS (AQE of 23.15%). This work provides a new insight into the design and synthesis of porous Z-scheme heterojunction system with excellent solar light adsorption and highly-efficient charge spatial separation.