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Coupling High-Entropy Core with Rh Shell for Efficient pH-Universal Hydrogen Evolution.

Min Wei1, Yuyan Sun1, Junyu Zhang1

  • 1The Institute for Advanced Studies, Wuhan University, Wuhan, 430072, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

Researchers developed novel core-shell (CS) high-entropy alloy (HEA) nanoparticles for efficient hydrogen evolution reaction (HER) catalysis across all pH levels. These advanced catalysts show significantly enhanced activity compared to traditional materials.

Keywords:
PtCoNiMoRh@Rh core–shellhigh entropy catalysismultiple active sitespH‐universal hydrogen evolution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • High-entropy alloys (HEAs) offer unique properties for catalysis.
  • Core-shell (CS) nanostructures can enhance catalytic performance.
  • Integrating CS structures with HEAs presents significant challenges.

Purpose of the Study:

  • To synthesize and characterize novel PtCoNiMoRh@Rh CS nanoparticles.
  • To evaluate the pH-universal hydrogen evolution reaction (HER) activity of these nanoparticles.
  • To understand the structure-activity relationship for improved HEA catalyst design.

Main Methods:

  • Synthesis of PtCoNiMoRh@Rh core-shell nanoparticles (∼5.7 nm).
  • Electrochemical testing for hydrogen evolution reaction (HER) in acidic, neutral, and alkaline electrolytes.
  • Theoretical calculations to investigate electronic structure and orbital shifts.

Main Results:

  • PtCoNiMoRh@Rh CS nanoparticles demonstrate exceptional HER activity, requiring low overpotentials (9.1 mV in acid, 24.9 mV in neutral, 17.1 mV in alkaline) for -10 mA cm⁻².
  • Mass activity is significantly higher than Rh/C (5.8x in acid, 2.79x in neutral, 91.8x in alkaline).
  • Theoretical calculations reveal reduced Rh 4d unoccupied states and synergistic effects between the HEA core and Rh shell contribute to enhanced activity.

Conclusions:

  • The developed PtCoNiMoRh@Rh CS nanoparticles are highly effective for pH-universal HER.
  • The core-shell architecture and HEA composition are crucial for superior catalytic performance.
  • This study provides a pathway for designing advanced HEA catalysts with CS structures for energy applications.