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Facile structure design based on C3N4 for mediator-free Z-scheme water splitting under visible light

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Author(s)

Guixia Zhao, Xiubing Huang, Federica Fina, Guan Zhang, John Thomas Sirr Irvine

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Abstract

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.

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Original languageEnglish
Pages (from-to)3416-3422
JournalCatalysis Science & Technology
Volume5
Issue number6
Early online date28 Apr 2015
DOIs
Publication statusPublished - 1 Jun 2015

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