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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Modulating Support Effect in High-Entropy Sulfide via La Single-Atom for Boosted Oxygen Evolution.

Yi Wan1, Wenrui Wei1, Lin Li1

  • 1School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 17, 2025
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Summary

Lanthanum single-atom modified hollow carbon spheres boost high-entropy sulfide electrocatalysts for enhanced oxygen evolution reaction (OER) kinetics. This novel material significantly reduces overpotential, improving energy efficiency.

Keywords:
La single‐atomelectrocatalysthigh‐entropy sulfideoxygen evolutionsupport effect

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient electrocatalysts are crucial for accelerating the oxygen evolution reaction (OER).
  • High-entropy sulfide (HES) materials offer tunable electronic properties for catalytic applications.
  • Single-atom modification can precisely control catalyst activity and electronic structure.

Purpose of the Study:

  • To investigate the positive effect of lanthanum (La) single-atom modified hollow carbon sphere (HCS) support on the OER activity of a high-entropy sulfide (HES) material.
  • To elucidate the mechanism by which La single-atoms enhance OER performance.
  • To develop an efficient electrocatalyst for the oxygen evolution reaction.

Main Methods:

  • Synthesis of lanthanum single-atom modified hollow carbon sphere supported high-entropy sulfide ((FeCoNiCrCuAl)S@La-HCS).
  • Electrochemical characterization of the synthesized catalyst for OER performance evaluation.
  • Analysis of electronic structure modifications induced by La single-atom doping.

Main Results:

  • The (FeCoNiCrCuAl)S@La-HCS catalyst exhibited superior OER performance with a low overpotential of 297 mV at 100 mA cm⁻².
  • This performance surpasses that of the unmodified (FeCoNiCrCuAl)S@HCS (324 mV) and commercial RuO₂ (419 mV).
  • La single-atom doping facilitated electron redistribution and down-shifted the d-band center, reducing adsorption energy of OER intermediates.

Conclusions:

  • Lanthanum single-atom modification is an effective strategy to enhance the OER activity of high-entropy sulfide electrocatalysts.
  • The synergistic integration of single-atom catalysts with HES materials provides a promising pathway for efficient oxygen evolution.
  • This work offers valuable insights into designing advanced electrocatalysts for energy conversion applications.