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Fe-Rich Medium-Entropy Core-Shell Electrocatalyst for Hydrogen Evolution Reaction Under Large Current Density.

Yuxuan Shao1, Junjie Ni1, Jie Yin1

  • 1School of Materials Science and Engineering, Liaocheng University, Liaocheng, 252000, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 10, 2024
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A new iron-rich medium-entropy alloy (MEA) catalyst offers a stable and cost-effective alternative to platinum for green hydrogen production. This advanced material demonstrates superior durability and efficiency in hydrogen evolution reactions under high current conditions.

Keywords:
HER catalystcore‐shell structurehomogenous interfacemedium or high entropy alloyswater electrolysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Platinum (Pt) based catalysts are expensive and suffer from low stability under high current densities, hindering efficient green hydrogen production.
  • Development of stable, efficient, and cost-competitive electrocatalysts is crucial for advancing hydrogen evolution reaction (HER) technologies.

Purpose of the Study:

  • To synthesize and evaluate a novel Fe-rich medium-entropy alloy (MEA) catalyst with a core-shell structure for enhanced hydrogen evolution reaction (HER) performance.
  • To investigate the catalytic activity, durability, and underlying mechanisms of the MEA catalyst in alkaline media.

Main Methods:

  • Synthesis of a core-shell structured Fe-rich medium-entropy alloy (MEA) catalyst featuring a near-zero-resistance homogeneous interface.
  • Electrochemical characterization of the MEA catalyst, including overpotential measurements at 1,000 mA cm⁻² and Tafel slope analysis in 1.0 M KOH.
  • Comparison of the MEA catalyst's performance against the benchmark 20% Pt/C catalyst.

Main Results:

  • The synthesized low-cost MEA catalyst exhibited outstanding durability and catalytic activity, with an overpotential of 343.6 mV at 1,000 mA cm⁻² and a Tafel slope of 67.6 mV dec⁻¹.
  • These results significantly outperformed the benchmark 20% Pt/C catalyst (416.9 mV, 156.8 mV dec⁻¹).
  • The enhanced performance is attributed to the highly conductive homogeneous interface facilitating electron injection from the metallic core to the medium entropy oxide (MEO) shell, activating Fe/Ni/Co sites for efficient hydrogen evolution.

Conclusions:

  • The novel Fe-rich MEA catalyst demonstrates significant potential as a stable and efficient electrocatalyst for industrial high-current hydrogen evolution applications.
  • The core-shell structure with a homogeneous interface strategy offers a promising pathway for developing advanced, cost-competitive catalysts for green hydrogen production.
  • This work broadens the application prospects of medium-entropy alloys (MEAs) in electrochemical energy conversion.