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Corrosion-resistant cobalt phosphide electrocatalysts for salinity tolerance hydrogen evolution.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Seawater electrolysis is a promising route for large-scale, low-cost hydrogen production.
  • Increasing salt concentrations in seawater significantly degrade catalyst activity during hydrogen evolution.

Purpose of the Study:

  • To discover a catalyst that maintains activity in high salinity electrolytes.
  • To develop a robust electrode for efficient and stable seawater splitting.

Main Methods:

  • Molecular dynamic simulations to identify chloride ion rejection properties of CoP.
  • In-situ growth of homogeneous CoP on reduced graphene oxide (rGO) nanosheets.
  • Fabrication of a binder-free electrode on Ti fiber felt.

Main Results:

  • The CoP/rGO@Ti electrode demonstrated excellent catalytic activity and stability in alkaline electrolytes.
  • The catalyst maintained performance in saturated NaCl, with overpotential increasing by less than 28 mV at 10 mA cm⁻².
  • The material exhibited superior corrosion resistance with low solubility (0.04%).

Conclusions:

  • CoP possesses intrinsic chloride ion repulsion, crucial for salinity-tolerant hydrogen evolution.
  • The developed binder-free CoP/rGO@Ti electrode is highly efficient for seawater splitting.
  • This research offers a new direction for designing advanced electrocatalysts for hydrogen production in saline environments.