Unique Cu@CuPt Core-Shell Concave Octahedron with Enhanced Methanol Oxidation Activity

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Developing cost-effective, active, and stable electrochemical catalysts remains a significant challenge.
• Optimizing catalyst efficiency for electrochemical reactions requires novel strategies, such as engineering nanocrystal surfaces and architectures.
• Pt-based alloy nanocrystals with high-index surfaces offer potential for improved catalytic performance.

Purpose of the Study:

• To synthesize novel Cu@CuPt core-shell concave octahedron nanocrystals.
• To investigate the catalytic activity and stability of these nanocrystals for electrochemical reactions.
• To explore a facile method for fabricating nanocrystals with controlled composition and structure.

Main Methods:

• A one-pot facile solvothermal process was employed for synthesis.
• Temperature regulation controlled the reduction rates of Cu and Pt ions, enabling sequential atom stacking.
• The resulting core-shell nanoparticles possess concave structures with high-index surfaces ({312} and {413}).

Main Results:

• The synthesized Cu@CuPt core-shell concave octahedrons exhibited outstanding activity and durability.
• Specific and mass activities for methanol oxidation reaction were 8.6 and 13.1 times higher than commercial Pt/C, respectively.
• The catalyst demonstrated superior durability and anti-aggregation properties under harsh electrochemical conditions.

Conclusions:

• The facile solvothermal method provides a novel approach for fabricating nanocrystals with controlled compositional distribution.
• The Cu@CuPt core-shell concave octahedron nanocrystals show great promise for applications in direct methanol fuel cells.
• Engineered high-index surfaces on nanocrystals are beneficial for enhancing electrochemical catalyst performance.