Fe–Ni-based alloys as highly active and low-cost oxygen evolution reaction catalyst in alkaline media - Université Grenoble Alpes Accéder directement au contenu
Article Dans Une Revue Nature Materials Année : 2024

Fe–Ni-based alloys as highly active and low-cost oxygen evolution reaction catalyst in alkaline media

Résumé

NiFe-based oxo-hydroxides are highly active for the oxygen evolution reaction but require complex synthesis and are poorly durable when deposited on foreign supports. Herein we demonstrate that easily processable, Earth-abundant and cheap Fe–Ni alloys spontaneously develop a highly active NiFe oxo-hydroxide surface, exsolved upon electrochemical activation. While the manufacturing process and the initial surface state of the alloys do not impact the oxygen evolution reaction performance, the growth/composition of the NiFe oxo-hydroxide surface layer depends on the alloying elements and initial atomic Fe/Ni ratio, hence driving oxygen evolution reaction activity. Whatever the initial Fe/Ni ratio of the Fe–Ni alloy (varying between 0.004 and 7.4), the best oxygen evolution reaction performance (beyond that of commercial IrO2) and durability was obtained for a surface Fe/Ni ratio between 0.2 and 0.4 and includes numerous active sites (high NiIII/NiII capacitive response) and high efficiency (high Fe/Ni ratio). This knowledge paves the way to active and durable Fe–Ni alloy oxygen-evolving electrodes for alkaline water electrolysers.
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Dates et versions

hal-04394047 , version 1 (17-01-2024)

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Lucile Magnier, Garance Cossard, Vincent Martin, Céline Pascal, Virginie Roche, et al.. Fe–Ni-based alloys as highly active and low-cost oxygen evolution reaction catalyst in alkaline media. Nature Materials, 2024, ⟨10.1038/s41563-023-01744-5⟩. ⟨hal-04394047⟩
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