Core–shell Fe3O4@CoFe2O4 nanoparticles as high-performance anode catalysts for enhanced oxygen evolution reaction

Water electrolysis is a promising and environmentally friendly means for renewable energy storage. Recent progress in the development of anion exchange membranes (AEMs) has provided new perspectives for high-performance anode catalysts based on transition metal oxides (TMOs) for the sluggish anodic...

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Published in:Sustainable energy & fuels 2023-07, Vol.7 (14), p.3239-3243
Main Authors: Royer, Lisa, Makarchuk, Iryna, Hettler, Simon, Arenal, Raul, Asset, Tristan, Rotonnelli, Benjamin, Bonnefont, Antoine, Savinova, Elena, Pichon, Benoit P
Format: Article
Language:English
Subjects:
Anion exchange
Anion exchanging
Black carbon
Carbon black
Catalysts
Cobalt ferrites
Core-shell particles
Core-shell structure
Electrolysis
Energy storage
Iron oxides
Nanoparticles
Oxygen evolution reactions
Renewable energy
Transition metal oxides
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Summary:Water electrolysis is a promising and environmentally friendly means for renewable energy storage. Recent progress in the development of anion exchange membranes (AEMs) has provided new perspectives for high-performance anode catalysts based on transition metal oxides (TMOs) for the sluggish anodic oxygen evolution reaction (OER). Here, we report on core–shell nanoparticles (Fe3O4@CoFe2O4) which allow combining an electrocatalytic shell (CoFe2O4) with a conductive core (Fe3O4). Such an original approach significantly minimizes critical Co content in the catalyst and avoids addition of unstable conductive carbon black. The core–shell nanoparticles outperform Co(1−x)Fe(2+x)O4 nanoparticles and show an exceptional OER activity per Co unit mass (2800 A gcobalt−1 at 1.65 V vs. RHE) suggesting synergistic interaction between the core and the shell. Along with the core–shell structure, the size of the Fe3O4 core is a critical parameter, with a large conductive Fe3O4 core being beneficial for OER enhancement.
ISSN:2398-4902
DOI:10.1039/d3se00130j