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Atomic-Scale Core/Shell Structure Engineering Induces Precise Tensile Strain to Boost Hydrogen Evolution Catalysis.

Han Zhu1, Guohua Gao2, Mingliang Du1

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Summary
This summary is machine-generated.

Precisely tuning surface strain on cobalt-9-sulfide-8/molybdenum-disulfide core/shell nanocrystals enhances hydrogen evolution reaction (HER) activity. The strained Co9S8/1L MoS2 catalyst shows superior performance due to optimized hydrogen adsorption and reaction kinetics.

Keywords:
electrocatalysishydrogen evolutionmaterials chemistrystructure engineeringtensile strain

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Area of Science:

  • Materials Science
  • Catalysis
  • Sustainable Energy

Background:

  • Tuning surface strain is a promising strategy for enhancing catalytic activity.
  • Precise control over surface strain is crucial for mechanistic studies in catalysis.
  • Developing efficient catalysts for the hydrogen evolution reaction (HER) is vital for sustainable energy.

Purpose of the Study:

  • To demonstrate a method for precisely tuning tensile surface strain on Co9S8/MoS2 core/shell nanocrystals.
  • To investigate the effect of controlled surface strain on HER activity.
  • To correlate surface strain with catalytic performance for improved hydrogen production.

Main Methods:

  • Fabrication of Co9S8/MoS2 core/shell nanocrystals with varying MoS2 shell thicknesses (1L to 5L).
  • Precise tuning of tensile surface strain by controlling the number of MoS2 layers.
  • Electrochemical characterization of HER activity, including overpotential and Tafel slope measurements.
  • Density functional theory (DFT) calculations to elucidate reaction mechanisms and energy barriers.

Main Results:

  • Tensile surface strain was precisely tuned from 3.5% (1L MoS2) to 0% (5L MoS2).
  • The Co9S8/1L MoS2 nanocrystals (3.5% strain) exhibited the highest HER activity, with a low overpotential of 97 mV and a Tafel slope of 71 mV dec-1.
  • DFT calculations revealed that the strained Co9S8/1L MoS2 structure has the lowest hydrogen adsorption energy (-1.03 eV) and transition state energy barrier (0.29 eV), facilitating efficient H2 production.

Conclusions:

  • Precisely controlling the MoS2 shell thickness allows for effective tuning of surface strain in Co9S8/MoS2 core/shell nanocrystals.
  • Increased tensile surface strain significantly boosts HER activity by optimizing intermediate stabilization and reaction kinetics.
  • This study provides a mechanistic understanding of strain effects in catalysis, paving the way for designing highly active electrocatalysts for sustainable energy applications.