Premium
Magnetic NiFe 2 O 4 Nanoparticles Prepared via Non‐Aqueous Microwave‐Assisted Synthesis for Application in Electrocatalytic Water Oxidation
Author(s) -
Simon Christopher,
Zakaria Mohamed Barakat,
Kurz Hannah,
Tetzlaff David,
Blösser André,
Weiss Morten,
Timm Jana,
Weber Birgit,
Apfel UlfPeter,
Marschall Roland
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101716
Subject(s) - overpotential , tafel equation , spinel , materials science , nanoparticle , ferrite (magnet) , nickel , aqueous solution , nanocrystal , analytical chemistry (journal) , chemical engineering , ferrimagnetism , electrochemistry , magnetization , nanotechnology , metallurgy , electrode , chemistry , magnetic field , physics , composite material , chromatography , quantum mechanics , engineering
Phase‐pure spinel‐type magnetic nickel ferrite (NiFe 2 O 4 ) nanocrystals in the size range of 4 to 11 nm were successfully synthesized by a fast and energy‐saving microwave‐assisted approach. Size and accessible surface areas can be tuned precisely by the reaction parameters. Our results highlight the correlation between size, degree of inversion, and magnetic characteristics of NiFe 2 O 4 nanoparticles, which enables fine‐tuning of these parameters for a particular application without changing the elemental composition. Moreover, the application potential of the synthesized powders for the electrocatalytic oxygen evolution reaction in alkaline media was demonstrated, showing that a low degree of inversion is beneficial for the overall performance. The most active sample reaches an overpotential of 380 mV for water oxidation at 10 mA cm −2 and 38.8 mA cm −2 at 1.7 V vs. RHE, combined with a low Tafel slope of 63 mV dec −1 .