The enhancement of hydrogen evolution reaction on nanoplatelet-shaped MoS2 via anodic pretreatment

•Anodic pretreatment increases the HER efficiency of hydrothermally synthesized MoS2.•Increased HER efficiency is determined by the bridging S22− in the crystallite edges.•Electrochemical behaviour of the MoS2 crystallite edge is analogous to amorphous MoSx. This work presents the effect of anodic p...

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Bibliographic Details
Published in:Electrochimica acta 2024-01, Vol.475, p.143696, Article 143696
Main Authors: Gaigalas, Paulius, Bittencourt, Carla, Klimas, Vaclovas, Pakštas, Vidas, Jagminas, Arūnas
Format: Article
Language:English
Subjects:
Electrochemical performance
Hydrogen evolution
Molybdenum disulfide
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Summary:•Anodic pretreatment increases the HER efficiency of hydrothermally synthesized MoS2.•Increased HER efficiency is determined by the bridging S22− in the crystallite edges.•Electrochemical behaviour of the MoS2 crystallite edge is analogous to amorphous MoSx. This work presents the effect of anodic pretreatment of 2D-MoS2 nanoplatelet-shaped films hydrothermally synthesized on the anodized Ti substrate for electrocatalytic H2 evolution from water. Structural and compositional changes in MoS2 species assembly were studied by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The electrochemical performance of designed catalysts was studied in 0.5 mol L−1 H2SO4 solution by cyclic voltammetry and chronopotentiometry for 12 h. The growing hydrogen evolution reaction efficiency upon anodic pretreatment was ascribed to increased sulfur content in the MoS2 nanoplatelet edges in the form of more active bridging S22− and apical S2− groups.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2023.143696