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MoS2 versatile spray-coating of 3D electrodes for the hydrogen evolution reaction

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Abstract

A facile one-step MoS2 spray-coating method was applied to a range of rigid, flexible, porous and 3D printed carbon-based surfaces, yielding high loadings in MoS2 flakes. The characterization of MoS2 flakes from a commercial lubricant spray reveals up to micron-scale bulk sheets of the layered material, constituted in its majority by the semiconducting 2H polymorph, in the presence of the metallic 1T phase. Consequently, the process generates MoS2 spray-coated surfaces with improved hydrogen evolution reaction (HER) catalytic performance. In the case of carbon-based screen printed electrodes (SPE), a short-term thermal post-treatment of the MoS2 spray-coated SPE had a further beneficial effect in the HER overpotential. The MoS2 spray-coated 3D metallic meshes held the lowest HER overpotential of the series. Finally, MoS2 spray-coated 3D printed electrodes yielded improved heterogeneous charge transfer and a 500 mV shift in the required overpotential at a current density of −10 mA cm−2. The MoS2 spray-coated 3D printed electrode displayed an abundant coverage at the inner, external and planar zones of electrodes by the MoS2 sheets, even after long-term operation conditions. These outcomes can be beneficial for future tailoring of MoS2 spray-coated surfaces and their implementation in energy conversion technologies.

Graphical abstract: MoS2 versatile spray-coating of 3D electrodes for the hydrogen evolution reaction

  • This article is part of the themed collection: Nanocarbons
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Publication details

The article was received on 02 Mar 2019, accepted on 16 Apr 2019 and first published on 14 May 2019


Article type: Paper
DOI: 10.1039/C9NR01876J
Nanoscale, 2019, Advance Article

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    MoS2 versatile spray-coating of 3D electrodes for the hydrogen evolution reaction

    R. Gusmão, Z. Sofer, P. Marvan and M. Pumera, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR01876J

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