The influence of magnetic field (MF) on electrochemical catalytic properties of carbon supported Fe2Pt nanocatalysts is investigated. Nanocatalysts are produced through an external MF coupled microfluidic process. X-ray diffraction (XRD) measurements show that Fe2Pt nanocrystals (NCs) with larger sizes are synthesized when an external MF of 1.4 T is applied. X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) characterizations confirm that more Pt2+ reduces to Pt-0 and NCs grow larger under magnetic fields (MFs) than those without MFs. The increased coercivity indicates that more surface unpaired electrons are present and the surface spin configuration changes under MFs. NCs synthesized under MFs show better catalytic performance in alcohol electro-chemical catalytic oxidation reactions compared to samples synthesized without MFs. The mass activities significantly increase by 1.10 and 1.24 times and the specific activity in-creases up to 1.11 and 1.26 times for methanol and ethanol oxidation, respectively, compared to those without MFs. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.