PtCuNi Tetrahedra Catalysts with Tailored Surfaces for Efficient Alcohol Oxidation

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Direct methanol/ethanol alkaline fuel cells (DMAFCs/DEAFCs) are promising for mobile power.
• Platinum-based catalysts are effective but expensive and prone to poisoning.
• Efficient methanol and ethanol oxidation reactions (MOR/EOR) are crucial for fuel cell performance.

Purpose of the Study:

• To develop novel PtCuNi tetrahedra electrocatalysts for enhanced MOR and EOR.
• To optimize catalyst composition for improved specific and mass activity.
• To investigate the durability of the developed electrocatalysts.

Main Methods:

• Synthesis of PtCuNi tetrahedra electrocatalysts with a core-shell structure.
• Structural characterization to determine composition and morphology (Cu-rich core, PtNi-rich shell).
• Electrocatalytic studies to evaluate MOR and EOR performance, including activity and durability.

Main Results:

• Pt₅₆Cu₂₈Ni₁₆ tetrahedra exhibited specific activities of 14.0 ± 1.0 mA/cm² (MOR) and 11.2 ± 1.0 mA/cm² (EOR).
• Record high mass activities of 7.0 ± 0.5 A/mg_Pt (MOR) and 5.6 ± 0.6 A/mg_Pt (EOR) were achieved.
• The core-shell tetrahedra structure demonstrated significantly improved durability compared to existing catalysts.

Conclusions:

• PtCuNi tetrahedra electrocatalysts offer a high-performance, cost-effective alternative to traditional Pt-based catalysts.
• The tunable core-shell structure is key to optimizing catalytic activity and stability.
• These advanced electrocatalysts show great potential for next-generation DMAFCs/DEAFCs.