Overcoming the Catalytic Bucket Effect in Pt-based High-Entropy Nanocages Through Interface Defect and Strain...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• High-entropy alloys (HEAs) offer unique properties due to multi-elemental composition.
• Developing efficient and stable electrocatalysts is crucial for fuel cell technology.
• Nanostructured materials provide high surface areas for catalytic applications.

Purpose of the Study:

• To fabricate and characterize novel platinum-palladium-nickel-copper-manganese-gold high-entropy nanocages (PtPdNiCuMnAu HENCs).
• To investigate the synergistic effects of multi-component composition and nanostructure on electrocatalytic performance.
• To evaluate the potential of PtPdNiCuMnAu HENCs in membrane electrode assemblies for fuel cells.

Main Methods:

• Facile liquid-phase reduction followed by acid etching for HENC fabrication.
• Electrochemical characterization including half-wave potential and mass activity measurements.
• Accelerated durability testing and membrane electrode assembly performance evaluation.

Main Results:

• PtPdNiCuMnAu HENCs exhibited a half-wave potential of 0.925 V vs. RHE and a mass activity of 1.70 A/mgPt.
• The catalyst demonstrated exceptional stability with minimal degradation after 10,000 cycles.
• Membrane electrode assemblies achieved a peak power density of 381.6 ± 3.10 mW/cm².

Conclusions:

• The synergistic effects in PtPdNiCuMnAu HENCs significantly enhance electrocatalytic activity and stability.
• These HENCs represent a promising catalyst for advanced fuel cell applications.
• The fabrication method offers a scalable route to high-performance nanocage catalysts.