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Issue 31, 2013
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Photoelectrochemical properties of chemically exfoliated MoS2

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Abstract

Group 6 transition metal dichalcogenides (TMD) such as MoS2 are promising candidates for photocatalysis and photoelectrochemical applications. Despite their promise, scalable deposition of thin films remains a challenge for TMD-based photoanodes. Here we investigate the photoelectrochemical properties of ultra-thin films of chemically exfoliated MoS2 and its composites with TiO2 nanoparticles. We show that MoS2 monolayer films exhibit photoelectrochemical properties similar to bulk materials, generating photocurrent at excitation wavelengths above the direct band gap edge at ∼660 nm (∼1.9 eV). We also demonstrate that MoS2 monolayers adsorbed on TiO2 behave as effective photosensitizers. We find that in TiO2–MoS2 composite photoanodes, photoexcited hot electrons in MoS2 are able inject into TiO2 whilst holes are removed by the electrolyte so as to generate electrical current from incident light. Our results demonstrate the potential of solution-processed MoS2 monolayers for photoelectrochemical applications.

Graphical abstract: Photoelectrochemical properties of chemically exfoliated MoS2

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Publication details

The article was received on 25 Apr 2013, accepted on 17 Jun 2013 and first published on 17 Jun 2013


Article type: Paper
DOI: 10.1039/C3TA11633F
Citation: J. Mater. Chem. A, 2013,1, 8935-8941

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    Photoelectrochemical properties of chemically exfoliated MoS2

    L. A. King, W. Zhao, M. Chhowalla, D. J. Riley and G. Eda, J. Mater. Chem. A, 2013, 1, 8935
    DOI: 10.1039/C3TA11633F

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