New approach to fully ordered fct-FePt nanoparticles for much enhanced electrocatalysis in acid

Qing Li; Liheng Wu; Gang Wu; Dong Su; Haifeng Lv; Sen Zhang; Wenlei Zhu; Anix Casimir; Huiyuan Zhu; Adriana Mendoza-Garcia; Shouheng Sun

doi:10.1021/acs.nanolett.5b00320

New approach to fully ordered fct-FePt nanoparticles for much enhanced electrocatalysis in acid

Nano Lett. 2015 Apr 8;15(4):2468-73. doi: 10.1021/acs.nanolett.5b00320. Epub 2015 Mar 3.

Authors

Affiliations

¹ †Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States.
² ‡Department of Chemical and Biological Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260, United States.
³ §Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.

PMID: 25723811
DOI: 10.1021/acs.nanolett.5b00320

Abstract

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.

Keywords: electrocatalysis; face-centered tetragonal structure; hydrogen evolution; nanoparticles; oxygen reduction.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.