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Constructing noble-metal-free Z-scheme photocatalytic overall water splitting systems using MoS2 nanosheets modified CdS as a H2 evolution photocatalyst

Abstract

Photocatalytic overall splitting of H2O into H2 and O2 using Z-scheme systems is a promising method for solar hydrogen generation. Most currently designed Z-scheme systems are usually based on precious metal cocatalysts modified semiconductor photocatalysts, thus exploiting noble-metal-free cocatalysts to replace precious metals is of huge interest. Herein, noble-metal-free Z-scheme photocatalytic overall water splitting system was constructed by using MoS2/CdS as the H2 evolution photocatalyst, Co3O4/BiVO4 as the oxygen evolution photocatalyst and [Co(bpy)3]3+/[Co(bpy)3]2+ redox couple as an electron mediator under visible light irradiation. It is found that the H2 and O2 evolution rates is approximate to an ideal ratio of 2:1, and the highest H2 and O2 evolution rates under visible light irradiation (λ > 420 nm) were found to be 14.5 and 7.1 μmol h−1, respectively, with an excellent stability exceeded 12 h. The apparent quantum yield is reaching up to 1.04 % at wavelength λ = 420 nm even without any noble metal. The excellent stability and efficiency of this designed Z-scheme system in neutral water demonstrates its potential use for solar hydrogen generation. This work provides a noble-metal-free approach to construct Z-scheme photocatalytic overall water splitting system.

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Publication details

The article was received on 28 Jul 2017, accepted on 14 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06644A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Constructing noble-metal-free Z-scheme photocatalytic overall water splitting systems using MoS2 nanosheets modified CdS as a H2 evolution photocatalyst

    Y. Yuan, D. Chen, S. Yang, L. Yang, J. Wang, W. Tu, D. Cao, Z.T. Yu and Z. Zou, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06644A

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