Low Pt-content ternary PdCuPt nanodendrites: an efficient electrocatalyst for oxygen reduction reaction

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Dendritic nanostructures are gaining interest in electrocatalysis due to their unique properties.
• Developing efficient and durable electrocatalysts for the oxygen reduction reaction (ORR) is crucial for energy applications.

Purpose of the Study:

• To synthesize low platinum-content palladium-copper-platinum (PdCuPt) ternary nanodendrites.
• To evaluate the electrocatalytic performance and stability of the synthesized nanodendrites for the oxygen reduction reaction (ORR) in acidic media.

Main Methods:

• Bromide ion-mediated synthesis using a galvanic replacement reaction between a platinum precursor and a palladium-copper (PdCu) template in aqueous solution.
• Electrocatalytic performance testing for oxygen reduction reaction (ORR) in acid solution.
• Long-term stability assessment through cycling tests.

Main Results:

• Successfully synthesized PdCuPt ternary nanodendrites with controlled composition and structure.
• The PdCuPt nanodendrites exhibited significantly enhanced mass activity (1.73 A mg_Pt^-1 at 0.85 V vs. RHE), which is 14 times higher than commercial Pt/C.
• Demonstrated improved durability, maintaining 70% of electrochemical surface area after 5,000 cycles in acidic solution.

Conclusions:

• The bromide ion-mediated synthesis offers an efficient route to produce trimetallic alloys for ORR.
• The developed PdCuPt nanodendrites represent a promising alternative to commercial catalysts due to their superior activity and stability.
• This study provides a new method for designing advanced electrocatalysts with tailored nanostructures.