Morphology and Activity Tuning of Cu3Pt/C Ordered Intermetallic Nanoparticles by Selective Electrochemical Dealloying

• Published in: Nano letters 2015-02, Vol.15 (2), p.1343-1348
• Main Authors: Wang, Deli, Yu, Yingchao, Zhu, Jing, Liu, Sufen, Muller, David A, Abruña, Héctor D
• Format: Article
• Language: English
• Subjects: dealloying; electrocatalyst; fuel cells; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; MATERIALS SCIENCE; metal nanoparticles; nanoparticles intermetallics; ordered intermetallic; oxygen reduction reaction; platinum; redox reactions
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/nl504597j

Improving the catalytic activity of Pt-based bimetallic nanoparticles is a key challenge in the application of proton-exchange membrane fuel cells. Electrochemical dealloying represents a powerful approach for tuning the surface structure and morphology of these catalyst nanoparticles. We present a comprehensive study of using electrochemical dealloying methods to control the morphology of ordered Cu3Pt/C intermetallic nanoparticles, which could dramatically affect their electrocatalytic activity for the oxygen reduction reaction (ORR). Depending on the electrochemical dealloying conditions, the nanoparticles with Pt-rich core–shell or porous structures were formed. We further demonstrate that the core–shell and porous morphologies can be combined to achieve the highest ORR activity. This strategy provides new guidelines for optimizing nanoparticles synthesis and improving electrocatalytic activity.