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High-Entropy Alloy Nano-Aggregates Enable Durable and High-Efficiency Oxygen Reduction Reaction.

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  • 1School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, China.

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Summary

High-entropy alloys (HEAs) show great promise as electrocatalysts. This study developed PtRhPdIrRu HEA nanoaggregates with superior oxygen reduction reaction (ORR) activity and stability in acidic and alkaline conditions.

Keywords:
high‐entropy alloy nano‐aggregatesoxygen reduction reactionzeta potential

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • High-entropy alloys (HEAs) possess unique properties beneficial for catalysis.
  • Electrocatalysts are crucial for energy conversion technologies like fuel cells.
  • Oxygen reduction reaction (ORR) is a key process in many electrochemical applications.

Purpose of the Study:

  • To synthesize PtRhPdIrRu HEA nanoaggregates.
  • To evaluate their electrocatalytic activity and stability for the ORR.
  • To compare their performance against commercial catalysts.

Main Methods:

  • Synthesis of HEA nanoaggregates via controlled zeta potential.
  • Electrochemical characterization of ORR activity in acidic and alkaline media.
  • Long-term stability testing through cyclic voltammetry.

Main Results:

  • The synthesized HEA nanoaggregates exhibited excellent ORR activity, surpassing commercial Pt/C.
  • Exceptional stability was observed, with high half-wave potentials retained after extensive cycling.
  • Performance was superior in both acidic (0.851 V after 13,000 cycles) and alkaline (0.864 V after 30,000 cycles) electrolytes.

Conclusions:

  • PtRhPdIrRu HEA nanoaggregates are highly effective ORR electrocatalysts.
  • Their superior activity and durability make them promising for next-generation energy devices.
  • Controlled synthesis is key to unlocking the potential of HEAs in electrocatalysis.