Magnetic NiFe₂O₄ Nanoparticles Prepared via Non-Aqueous Microwave-Assisted Synthesis for Application in Electrocatalytic Water Oxidation

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Simon, Christopher ; Zakaria, Mohamed Barakat ; Kurz, Hannah ; Tetzlaff, David ; Blößer, André ; Weiß, Morten ; Timm, Jana ; Weber, Birgit ; Apfel, Ulf-Peter ; Marschall, Roland:
Magnetic NiFe₂O₄ Nanoparticles Prepared via Non-Aqueous Microwave-Assisted Synthesis for Application in Electrocatalytic Water Oxidation.
In: Chemistry : a European Journal. Bd. 27 (2021) Heft 68 . - S. 16990-17001.
ISSN 1521-3765
DOI der Verlagsversion: https://doi.org/10.1002/chem.202101716

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Abstract

Phase-pure spinel-type magnetic nickel ferrite (NiFe₂O₄) 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 NiFe₂O₄ 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.