4.7 Article

Interface engineering heterostructured MoS2/WS2-reduced graphene Oxide for enhanced hydrogen Evolution electrocatalysts

Journal

SEPARATION AND PURIFICATION TECHNOLOGY
Volume 278, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.seppur.2021.119569

Keywords

MoS2; Heterostructures; Hydrogen Evolution Reaction; DFT calculations; Synergistic effect

Funding

  1. National Natural Sci-ence Foundation of China [11774156, 21671107]
  2. National Laboratory of Solid State Microstructures, Nanjing University [M34021]

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The study successfully enhanced the electrocatalytic activity through the design of nanoflower-liked MoS2/WS2-reduced Graphene Oxide (rGO) heterostructures, offering a new pathway for reducing dynamic overpotentials.
Hydrogen Evolution Reaction (HER) has been regarded as a potential way to produce hydrogen with zero pollution emission. However, this route of HER still remains some difficulties due to the intrinsic sluggish kinetics, which requires a high efficient electrocatalyst to reduce the dynamic overpotentials. In our study, nanoflower-liked MoS2/WS2-reduced Graphene Oxide (rGO) heterostructures are rationally designed in experiments via a simple and easy-controlled two-step hydrothermal route. Attribute to the heterostructured MoS2/WS2-rGO with large special surface area, abundant active sites and the synergetic effect, the electrocatalytic activity of MoS2/WS2-rGO have markedly enhanced, only require a low overpotential (118 mV) to attain a current density of 10 mA cm(-2) and the Tafel slope in response is 59 mV.dec(-1). In addition, the first-principles calculations of density functional theory (DFT) revealed that the introduction of the interface actually couples MoS2 and WS2 by van der Waals (vdW) interaction and the synergistic effect can change the charge distribution, and thus enabling to improve the HER efficiency. A successful strategy to rational develop of electrocatalysts is attained by integration of experiment and theory, which might offer an avenue for the development of other heterostructured materials as electrocatalysis for water splitting.

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