Kinetically Controlling Surface Structure to Construct Defect-Rich Intermetallic Nanocrystals: Effective and Stable...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Surface defects significantly influence nanocatalyst performance.
• Controlling surface defects is crucial for optimizing catalytic reactions.
• Formic acid electro-oxidation is a key reaction for fuel cells.

Purpose of the Study:

• To achieve kinetic control over surface defect formation in intermetallic nanocrystals.
• To synthesize cubic, concave cubic, and defect-rich cubic platinum-tin (Pt3Sn) nanocrystals.
• To evaluate the electrocatalytic performance of these nanocrystals for formic acid oxidation.

Main Methods:

• Kinetic control synthesis of Pt3Sn nanocrystals with varying surface defects.
• Fabrication of Pt-Mn nanocrystals to demonstrate the generality of the kinetic approach.
• Electrochemical testing for formic acid electro-oxidation activity and stability.

Main Results:

• Successfully prepared cubic, concave cubic, and defect-rich cubic Pt3Sn nanocrystals.
• Demonstrated the kinetic approach's versatility with Pt-Mn nanocrystal synthesis.
• Defect-rich nanocrystals exhibited superior catalytic activity and stability.

Conclusions:

• Kinetic control is an effective strategy for tailoring surface defects in nanocrystals.
• Defect-rich Pt3Sn nanocrystals show promise for efficient and stable formic acid electro-oxidation.
• The developed method has potential applications in designing advanced fuel cell catalysts.