[NiFe]-(Oxy)Sulfides Derived from NiFe₂O₄ for the Alkaline Hydrogen Evolution Reaction

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Tetzlaff, David ; Alagarasan, Vasanth ; Simon, Christopher ; Siegmund, Daniel ; junge Puring, Kai ; Marschall, Roland ; Apfel, Ulf-Peter:
[NiFe]-(Oxy)Sulfides Derived from NiFe₂O₄ for the Alkaline Hydrogen Evolution Reaction.
In: Energies. Bd. 15 (2022) Heft 2 . - No. 543.
ISSN 1996-1073
DOI: https://doi.org/10.3390/en15020543

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Abstract

The development of noble-metal-free electrocatalysts is regarded as a key factor for realizing industrial-scale hydrogen production powered by renewable energy sources. Inspired by nature, which uses Fe- and Ni-containing enzymes for efficient hydrogen generation, Fe/Ni-containing chalcogenides, such as oxides and sulfides, received increasing attention as promising electrocatalysts to produce hydrogen. We herein present a novel synthetic procedure for mixed Fe/Ni (oxy)sulfide materials by the controlled (partial) sulfidation of NiFe2O4 (NFO) nanoparticles in H2S-containing atmospheres. The variation in H2S concentration and the temperature allows for a precise control of stoichiometry and phase composition. The obtained sulfidized materials (NFS) catalyze the hydrogen evolution reaction (HER) with increased activity in comparison to NFO, up to −10 and −100 mA cm−2 at an overpotential of approx. 250 and 450 mV, respectively.