Abstract
To fabricate an electrocatalyst containing nanostructured layers of WOy and MoS x , a sequential formation of tungsten oxide and molybdenum sulfide thin films is performed by means of the pulsed laser deposition of W and Mo in low-pressure air and hydrogen sulfide media, respectively. The reactive medium pressure and the substrate (glassy carbon) temperature are varied during and after the deposition. WOy thin films of various morphologies and structures determining certain differences in their catalytic properties in the reaction of hydrogen evolution in acidic solutions are obtained. However, the catalytic efficiency of the obtained WO y nanoelements (spheres, needles, and sheets) with amorphous and crystalline structures appears to be insufficient. Additional deposition of MoS x with an amorphous structure results in a significant improvement of the catalytic properties. Sulfur atoms in the MoSx amorphous matrix cause the formation of catalytically active sites, while the developed surface of the WO y stimulates an increase in the catalyst total active area. Penetration of hydrogen effectively formed on MoS x into the bulk of thin films of WO y provides a crucial electrocatalysis condition—low current resistance in the support layer with a large exposed surface area.
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Original Russian Text © V.N. Nevolin, S.N. Grigoriev, V.Yu. Fominski, R.I. Romanov, M.A. Volosova, D.V. Fominski, P.S. Dzhumaev, 2017, published in Perspektivnye Materialy, 2017, No. 7, pp. 34–45.
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Nevolin, V.N., Grigoriev, S.N., Fominski, V.Y. et al. Application of Pulsed Laser Deposition in Reactive Gaseous Media to Fabricate an Effective Hybrid MoS x /WO y Catalyst for the Reaction of Hydrogen Evolution. Inorg. Mater. Appl. Res. 9, 297–304 (2018). https://doi.org/10.1134/S2075113318020211
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DOI: https://doi.org/10.1134/S2075113318020211