MoS2 Nanoflowers Grown on Plasma-Induced W-Anchored Graphene for Efficient and Stable H2 Production Through Seawater Electrolysis

Van Dien Dang, Raghunath Putikam, Ming Chang Lin, Kung Hwa Wei*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Herein, it is found that 3D transition metal dichalcogenide (TMD)—MoS2 nanoflowers—grown on 2D tungsten oxide-anchored graphene nanosheets (MoS2@W-G) functions as a superior catalyst for the hydrogen evolution reaction (HER) under both acidic and alkaline conditions. The optimized weight ratio of MoS2@W-G (MoS2:W-G/1.5:1) in 0.5 M H2SO4 achieves a low overpotential of 78 mV at 10 mA cm–2, a small Tafel slope of 48 mV dec–1, and a high exchange current density (0.321 mA cm⁻2). Furthermore, the same MoS2@W-G composite exhibits stable HER performance when using real seawater, with Faradaic efficiencies of 96 and 94% in acidic and alkaline media, respectively. Density functional theory calculations based on the hybrid MoS2@W-G structure model confirm that suitable hybridization of 3D MoS2 and 2D W-G nanosheets can lower the hydrogen adsorption: Gibbs free energy (∆GH*) from 1.89 eV for MoS2 to –0.13 eV for the MoS2@W-G composite. The excellent HER activity of the 3D/2D hybridized MoS2@W-G composite arises from abundance of active heterostructure interfaces, optimizing the electrical configuration, thereby accelerating the adsorption and dissociation of H2O. These findings suggest a new approach for the rational development of alternative 3D/2D TMD/graphene electrocatalysts for HER applications using seawater.

Original languageEnglish
JournalSmall
DOIs
StateAccepted/In press - 2023

Keywords

  • 3D/2D hybridized structures
  • graphene nanosheets
  • hydrogen evolution reaction
  • MoS nanoflower
  • seawater electrolysis
  • W-anchored

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