Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 5, Issue 6, Pages 3416-3422Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cy00379b
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/K006800/1, EP/K036769/1, EP/K022237/1]
- Engineering and Physical Sciences Research Council [EP/I022570/1, EP/K015540/1, EP/K022237/1, EP/K036769/1] Funding Source: researchfish
- EPSRC [EP/K036769/1, EP/K015540/1, EP/K022237/1, EP/I022570/1] Funding Source: UKRI
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In this work, two photocatalysts (i.e., C3N4 and WO3) were successfully combined into a heterojunction structure by a facile hydrothermal method for mediator-free overall water splitting, analogous to the natural photosynthesis over a two-step photoexcitation Z-scheme system. Hydrogen and oxygen are evolved with a 2 : 1 ratio by irradiating the C3N4-WO3 composites loaded with Pt under visible light (lambda > 420 nm) without any redox mediator. Introducing reduced graphene oxide (rGO) into the C3N4-WO3 composites enhances the water splitting efficiency. Through optimizing the mass ratio in the C3N4-WO3 composites, rGO content, amount of loaded Pt and pH value of the reacting system, the highest H-2/O-2 evolution rates of 2.84 and 1.46 mu mol h(-1) can be obtained, with a quantum yield of 0.9%. Our findings demonstrate that the hydrothermal method is a promising strategy for constructing intimate heterostructures for Z-scheme water-splitting systems without using any redox mediator, and that rGO can be used to further enhance the performance in optimized conditions.
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