Journal
JOURNAL OF CLEANER PRODUCTION
Volume 322, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.129018
Keywords
MoC; CdS; Visible light; Cocatalyst; Photocatalytic hydrogen production
Categories
Funding
- National Natural Science Foundation of China [22075046, 51972063, 21501127, 51502185]
- Natural Science Foundation of Fujian Province [2020J06038, 2019J01256]
- 111 Project [D17005]
- China postdoctoral science foundation [2019TQ0061]
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The effective CdS/MoC photocatalyst enhances hydrogen production under visible light and shows promising potential as an alternative to Pt for photocatalytic hydrogen production from water.
Exploration of efficient and stable transition metal-based co-catalyst is of great importance for large-scale hydrogen production in the mean of photocatalytic water splitting. Herein, we propose an effective CdS/MoC photocatalyst for enhanced photocatalytic H-2 evolution under visible light irradiation (>= 420 nm). Upon coupling to CdS through a facile solution-mixing method, MoC was functionalized as an effective co-catalyst that accepts interface electron from CdS while promoting charges separation. Furthermore, DFT also confirmed a facilitated H* adsorption on CdS/MoC through its lowered Gibbs free energy (Delta G(H)*) of 0.37 eV, which is beneficial for H-2 production too. As a result, the optimum photocatalyst, with 5 wt% MoC coupled to CdS, induces the best hydrogen production rate of 224.5 mu mol h(-1), which is 7.5 times higher than that of pristine CdS. Meanwhile, an apparent quantum efficiency (AQE) of 7.6% was also recorded at 420 nm. In terms of H-2 generation, the synthesized CdS/MoC (5 wt%) is more superior to CdS/Pt (5 wt%) in an extent of 44.5%. This work confirms the competency of MoC as an effective cocatalyst and promising alternative to benchmarked Pt for photocatalytic hydrogen production from water.
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