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Long-range ordered high-entropy intermetallics enable stable and efficient hydrogen evolution in seawater.

Yujun Liu1, Jian Cai1, Wenchao Zhang2

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Summary

High-entropy intermetallics (HEIs) were synthesized for efficient water splitting. The novel (FeCoNi)(RuPt) HEI demonstrates excellent performance in alkaline seawater, crucial for catalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • High-entropy intermetallics (HEIs) offer unique properties for catalytic applications.
  • Developing efficient electrocatalysts for water splitting in saline environments is critical.

Purpose of the Study:

  • To synthesize long-range ordered high-entropy intermetallics (HEIs) using a thermodynamically-driven atomic ordering strategy.
  • To investigate the electrocatalytic activity of the (FeCoNi)(RuPt) HEI for water dissociation in alkaline seawater.

Main Methods:

  • Synthesis of (FeCoNi)(RuPt) HEI via a thermodynamically-driven atomic ordering strategy.
  • Electrochemical characterization including current density and overpotential measurements.
  • In situ Raman spectroscopy to identify active surface sites.

Main Results:

  • The (FeCoNi)(RuPt) HEI achieved a current density of 200 mA cm⁻² at an overpotential of 56 mV.
  • A low Tafel slope of 50.4 mV dec⁻¹ was recorded in alkaline seawater.
  • In situ Raman spectroscopy identified Co-OH, M-OH-M, and Pt-OH-Pt adsorption sites crucial for water dissociation.

Conclusions:

  • The synthesized (FeCoNi)(RuPt) HEI exhibits superior electrocatalytic performance for water splitting.
  • The identified active sites provide insights into the mechanism of water dissociation on HEIs.
  • This work highlights the potential of HEIs as efficient catalysts in challenging environments like alkaline seawater.