Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 41, Pages 21014-21023Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.05.249
Keywords
Mo3S4/Cd0.5Zn0.5S; Heterojunction; Porosity; Photocatalytic; H-2 evolution
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Funding
- National Natural Science Foundation of China [51472062, 21676065]
- Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education of China
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In this work, Mo3S4/Cd0.5Zn0.5S heterojunction with abundant porosity was in-situ synthesized by one-step hydrothermal method. Characterization results clearly indicate that the composite material are composed of nanoparticles with an average particle diameter about 65 nm and abundant inter-particle pores are present in between. The XPS analysis found that when Mo3S4 was introduced, the XPS peak positions of Cd2+ and Zn2+ were shifted from the XPS peak positions of Cd2+ and Zn2+ in pristine Cd0.5Zn0.5S, which indicates that there is an interaction between Mo3S4 and Cd0.5Zn0.5S at the interface. Sub- sequently, the Mo3S4/Cd0.5Zn0.5S (72.1 mmol h(-1) g(-1)) heterojunction can achieve much higher photocatalytic hydrogen production rate than the pristine Cdo s Zno 5S (7.54 mmol h(-1) g(-1)) and even higher than Cd0.5Zn0.5S (56.44 mmol h(-1) g(-1)) loaded with the noble metal Pt (2.0%), indicating that heterojunction can effectively enhance photocatalytic activity. In addition, the improvement in photocatalytic activity of Mo3S4/Cd0.5Zn0.5S is highly related with enhanced absorption and utilization of light due to the presence of the inter-particle pores which inhibit recombination of electron-hole pairs, promote charge separation and accelerate the migration of photogenerated carriers. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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