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Hexagonal Single-Crystal CoS Nanosheets: Controllable Synthesis and Tunable Oxygen Evolution Performance.

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Ultrathin cobalt sulfide (CoS) nanosheets excel as oxygen evolution reaction (OER) catalysts for water splitting. Thinner 2D CoS nanosheets exhibit superior catalytic activity and efficiency due to enhanced electronic properties and active sites.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Cobalt-based sulfides are promising oxygen evolution reaction (OER) catalysts for water splitting.
  • Their application is limited by poor morphology and small surface area.

Purpose of the Study:

  • To synthesize hexagonal single-crystal 2D CoS nanosheets of varying thicknesses.
  • To investigate the thickness-dependent OER performance and catalytic mechanisms.

Main Methods:

  • Atmospheric-pressure chemical vapor deposition for CoS nanosheet synthesis.
  • Electrochemical testing (OER, Tafel slope, charge transfer resistance, double-layer capacitance).
  • Density functional theory (DFT) calculations.

Main Results:

  • 5 nm CoS nanosheets (CoS-5) demonstrated superior OER performance with a 290 mV overpotential and 65.6 mV dec-1 Tafel slope.
  • CoS-5 exhibited lower charge transfer resistance and higher double-layer capacitance, indicating faster kinetics and larger active area.
  • DFT calculations confirmed enhanced electronic structure and H2O adsorption for thinner nanosheets.

Conclusions:

  • The thickness of 2D CoS nanosheets significantly impacts OER catalytic performance.
  • Ultrathin CoS nanosheets offer enhanced catalytic activity and efficiency for electrochemical water splitting.
  • This work provides insights into thickness-dependent catalysis and potential for new electronic/energy devices.