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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Iron modulated high entropy engineering boosting alkaline oxygen evolution.

Junhao Qin1, Mingwei Tang1, Hao Zhang1

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|June 29, 2025
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Summary
This summary is machine-generated.

A novel high-entropy alloy catalyst (FeCoNiZnP) shows excellent performance and durability for the oxygen evolution reaction (OER), crucial for efficient hydrogen production via water electrolysis.

Keywords:
Alkaline OERCatalystsElectrodepositionFeCoNiZnPHEA

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient electrocatalysts are essential for large-scale hydrogen production via water electrolysis.
  • Developing cost-effective, stable, and high-performance catalysts for the oxygen evolution reaction (OER) remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize a novel high-entropy alloy catalyst for enhanced OER performance.
  • To investigate the role of elemental composition and synergistic effects in catalyst activity and stability.

Main Methods:

  • Facile one-step electrodeposition of FeCoNiZnP catalyst on nickel foam.
  • Electrochemical testing in alkaline conditions to evaluate OER performance (overpotential, Tafel slope).
  • Long-term stability testing under high current densities.
  • Post-stability characterization to confirm structural and elemental integrity.
  • Density Functional Theory (DFT) calculations to elucidate reaction mechanisms and active sites.

Main Results:

  • The FeCoNiZnP catalyst achieved ultralow Tafel slopes (30 mV dec⁻¹) and low overpotentials (226 mV at 10 mA cm⁻², 278 mV at 100 mA cm⁻²).
  • Exceptional durability was demonstrated, with the catalyst maintaining performance and structure after 700 hours of operation.
  • Experimental and DFT analyses revealed that Fe incorporation optimizes electronic structure, facilitates charge transfer, and modulates intermediate adsorption, enhancing kinetics.
  • Synergistic effects among Fe, Co, Ni, Zn, and P created multiple active sites and improved stability via entropy stabilization.

Conclusions:

  • The developed cauliflower-like FeCoNiZnP high-entropy alloy catalyst exhibits superior OER activity and unprecedented durability.
  • Iron plays a critical role in enhancing catalytic performance through electronic structure modulation and charge transfer.
  • Strategic elemental combinations in high-entropy systems offer a promising pathway for designing advanced, stable electrocatalysts for water electrolysis.
  • This work provides valuable design principles for future high-performance electrocatalyst development.