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.
Bibliographical noteFunding Information:
M. P. acknowledges the financial support of Grant Agency of the Czech Republic (EXPRO: 19-26896X). R. G. acknowledges the European Structural and Investment Funds and Ministry of Education, Youth and Sport of the Czech Republic (MEYS) CHEMFELL4UCTP (No. CZ.02.2.69/0.0/0.0/17_050/0008485). This work was carried out with the financial support of the Neuron Foundation for Science support. The authors are thankful to M. Mendonça for helpful discussions about commercial sprays and to A. Ambrosi for his assistance with initial experiments.
All Science Journal Classification (ASJC) codes
- Materials Science(all)