New approach to fully ordered fct-FePt nanoparticles for much enhanced electrocatalysis in acid.
Fully ordered face-centered tetragonal (fct) FePt nanoparticles (NPs) are synthesized by thermal annealing of the MgO-coated dumbbell-like FePt-Fe3O4 NPs followed by acid washing to remove MgO. These fct-FePt NPs show strong ferromagnetism with room temperature coercivity reaching 33 kOe. They serve as a robust electrocatalyst for the oxygen reduction reaction (ORR) in 0.1 M HClO4 and hydrogen evolution reaction (HER) in 0.5 M H2SO4 with much enhanced activity (the most active fct-structured alloy NP catalyst ever reported) and stability (no obvious Fe loss and NP degradation after 20 000 cycles between 0.6 and 1.0 V (vs RHE)). Our work demonstrates a reliable approach to FePt NPs with much improved fct-ordering and catalytic efficiency for ORR and HER.
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Qing
Q
Li
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Liheng
L
Wu
‡Department of Chemical and Biological Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260, United States.
Gang
G
Wu
§Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.
Dong
D
Su
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Haifeng
H
Lv
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Sen
S
Zhang
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Wenlei
W
Zhu
‡Department of Chemical and Biological Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260, United States.
Anix
A
Casimir
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Huiyuan
H
Zhu
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Adriana
A
Mendoza-Garcia
†Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
Shouheng
S
Sun
electrocatalysis; face-centered tetragonal structure; hydrogen evolution; nanoparticles; oxygen reduction