Facile structure design based on C3N4 for mediator-free Z-scheme water splitting under visible light
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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 (λ > 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 H2/O2 evolution rates of 2.84 and 1.46 μmol 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.
Zhao , G , Huang , X , Fina , F , Zhang , G & Irvine , J T S 2015 , ' Facile structure design based on C 3 N 4 for mediator-free Z-scheme water splitting under visible light ' Catalysis Science & Technology , vol 5 , no. 6 , pp. 3416-3422 . DOI: 10.1039/C5CY00379B
Catalysis Science & Technology
Copyright 2015 the Authors. This open access article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/)
The authors thank the Engineering and Physical Sciences Research Council (EPSRC) platform grant EP/K006800/1, EP/K036769/1 and EP/K022237/1 for financial support.
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