title: Morphology and activity tuning of Cu₃Pt/C ordered intermetallic nanoparticles by selective electrochemical dealloying.
abstract: 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.
authors.affiliation: Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , 430074, Wuhan, People's Republic of China.
authors.forename: Deli
authors.initials: D
authors.lastname: Wang
authors.forename: Yingchao
authors.initials: Y
authors.lastname: Yu
authors.forename: Jing
authors.initials: J
authors.lastname: Zhu
authors.forename: Sufen
authors.initials: S
authors.lastname: Liu
authors.forename: David A
authors.initials: DA
authors.lastname: Muller
authors.forename: Héctor D
authors.initials: HD
authors.lastname: Abruña
keywords: Fuel cells; dealloying; electrocatalyst; ordered intermetallic; oxygen reduction reaction