Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 39, Pages 18242-18252Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.08.050
Keywords
CoWO4/CdS composites; Hydrogen evolution; Z-scheme; Visible light photocatalyst
Categories
Funding
- National Natural Science Foundation of China [21703019]
- Natural Science Foundation of Jiangsu Province, China [BK20150259]
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The artificial Z-scheme photocatalysts, simulating the natural photosynthesis, enables more efficient utilization of solar energy for sustainable fuel production. A novel direct Z-scheme CoWO4/CdS binary photocatalyst is synthesized by an in-situ hydrothermal method, and the enhanced activities of H-2 production and dye degradation are attained. The rate of H-2 production is 15.91 mmol/h/g, which is 24-fold higher than CdS. The CoWO4/CdS composites exhibited outstanding stability after five consecutive reactions. Meanwhile, the photocatalytic removal efficiencies of MG are about CdS < CWC-0.8 < CWC1.0 < CWC-1.4 < CWC-1.2. The preeminent photocatalytic property of CoWO4 /CdS composites is authenticated based on Z-scheme heterojunction. Most importantly, the enhancement mechanism is attributed to the effective isolation of photogenerated carriers and the existance of redox capabilities for CoWO4/CdS system. This work might provide novel conception for the design and construction of high-performance photocatalysts with direct Z-scheme. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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