Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 38, Pages 23995-24005Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.06.234
Keywords
The p-n junctions; The stacking fault structures; Photocatalytic hydrogen production; Stability
Categories
Funding
- National Natural Science Foundation of China [51236007, 51121092]
- National Basic Research Program of China (973) [2009CB220000]
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NiS modified three-dimensional pyramidic CdS with stacking fault structures were successfully synthesized by using the one-step method and an ammonia aqueous solvent as the hydrothermal solvent. Thus, CdS showed superior photocatalytic activities for hydrogen evolution from water under visible light irradiation (lambda >= 420 nm), which could achieve a hydrogen evolution rate of 49.2 mmol g(-1) h(-1), with an extremely high apparent quantum yield (AQY = 74.6%) at 420 nm. To our knowledge, this value is the highest reported efficiency value for NiSx modified CdS photocatalysts. CdS exhibited a three-dimensional pyramid structure with large specific surface areas, which may provide more active sites for the photocatalytic reaction. Stacking fault structures were observed in CdS by transmission electron microscopy (TEM). P-type NiS nanoparticles were highly dispersed on the surface of n-type CdS pyramids, forming p-n junctions at the interface. The stacking fault structures and junctions strengthened the separation of photo-carriers near the interface, which may greatly enhance the activity of photocatalytic hydrogen production for CdS. The catalyst also showed perfect stability, and the photoactivity showed no significant degradation during continuous hydrogen production over nearly 120 h, which has not been reported in the literature. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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