Communication Dans Un Congrès Année : 2025

Tuning the intrinsic catalytic activity of W and V doped MoSx for hydrogen evolution reaction

Résumé

With low CO2 emission and high energy density, green hydrogen is an alternative source to replace fossil fuels. At present, noble metals (Ir, Ru, Pt) and their oxides are the most effective electrocatalysts for hydrogen production from water via the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), due to their high current density and low overpotential requirement. 1, 2 However, scarcity and their high cost limit their practical application. Molybdenum disulfide (MoS2) is considered as a potential electrocatalyst to replace precious metals for HER, due to its availability and stability.1 However the active sites of MoS2 are only localized to the edges of the crystallites, while the basal planes are catalytically inert. Thus, numerous methods such as doping, phase engineering and heterostructure approaches are proposed to improve its HER performance. Element doping is another promising solution to activate the catalytically inert in-plane hexagonal MoS2 for efficient hydrogen adsorption besides promoting charge transport and modulating electron mobility. 2 Here, we describe the in situ synthesis of amorphous W- or V-doped MoSx via a one-step microwave synthesis. To alter the mechanical, electronic and electrochemical properties, the bulk material is further exfoliated using sonication in solution and microwave treatment.1,2 Electron microscopy and atomic force microscopy show the decrease in size from bulk MoSx to few-layers crystallites. W- and V-doping improved the catalytic efficiency of bulk MoSx by reducing the overpotential from 235 to 192 mV to reach 10 mA/cm2 in H2SO4 (pH~2). Further work is now devoted to depositing exfoliated doped-MoSx materials onto a transparent conductive electrode in contact with a light-harvesting semi-conductor for photoinduced hydrogen production within the European project PH2OTOGEN (ph2otogen.eu).

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Dates et versions

hal-05273156 , version 1 (22-09-2025)

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  • HAL Id : hal-05273156 , version 1

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Ching-Thian Moi, Céline Rivaux, Adina Morozan, Vincent Artero, Pascale Chenevier. Tuning the intrinsic catalytic activity of W and V doped MoSx for hydrogen evolution reaction. 5th International Solar Fuels Congress, Royal Society of Chemistry, Sep 2025, Newcastle (GB), United Kingdom. ⟨hal-05273156⟩
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