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Universal pH electrocatalytic hydrogen evolution with Au-based high entropy alloys.

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High-entropy alloy nanoparticles (AuPdFeNiCo HEA NPs) show enhanced hydrogen evolution reaction (HER) activity. These novel catalysts offer a promising alternative to precious metal electrocatalysts for efficient hydrogen production across various pH levels.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Reducing platinum-group metals in electrocatalysts is crucial for cost-effective hydrogen production.
  • High-entropy alloys (HEAs) present tunable compositions and surface activity for improved catalytic performance.

Purpose of the Study:

  • To synthesize and characterize novel AuPdFeNiCo HEA nanoparticles (NPs) for enhanced hydrogen evolution reaction (HER).
  • To evaluate the HER performance of these HEA NPs across a wide pH range and compare them to existing catalysts.

Main Methods:

  • Synthesis of AuPdFeNiCo HEA NPs via wet impregnation.
  • Characterization using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HR-TEM).
  • Electrochemical evaluation of HER performance in acidic, neutral, and alkaline electrolytes.

Main Results:

  • AuPdFeNiCo HEA NPs demonstrated superior HER activity compared to individual metal counterparts across all tested pH values.
  • These HEA NPs exhibited enhanced electrochemical activity over commercial Pt/C in both acidic and alkaline media.
  • In neutral electrolytes, AuPdFeNiCo HEA NPs achieved 100 mA cm⁻² at 540 mV, outperforming Pt/C (570 mV).

Conclusions:

  • AuPdFeNiCo HEA NPs are effective electrocatalysts for HER, offering high activity and stability.
  • These findings support the development of reduced precious metal electrocatalysts for diverse water electrolysis applications.
  • The study highlights the potential of HEAs in advancing sustainable hydrogen production technologies.