Cooperative Fe sites on transition metal (oxy)hydroxides drive high oxygen evolution activity in base

Yingqing Ou, Liam P. Twight, Bipasa Samanta, Lu Liu, Santu Biswas, Jessica L. Fehrs, Nicole A. Sagui, Javier Villalobos, Joaquín Morales-Santelices, Denis Antipin, Marcel Risch, Maytal Caspary Toroker () and Shannon W. Boettcher ()
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Yingqing Ou: University of Oregon
Liam P. Twight: University of Oregon
Bipasa Samanta: Technion—Israel Institute of Technology
Lu Liu: University of Oregon
Santu Biswas: Technion—Israel Institute of Technology
Jessica L. Fehrs: University of Oregon
Nicole A. Sagui: University of Oregon
Javier Villalobos: Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus, Helmholtz-Zentrum Berlin für Materialien und Energie
Joaquín Morales-Santelices: Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus, Helmholtz-Zentrum Berlin für Materialien und Energie
Denis Antipin: Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus, Helmholtz-Zentrum Berlin für Materialien und Energie
Marcel Risch: Nachwuchsgruppe Gestaltung des Sauerstoffentwicklungsmechanismus, Helmholtz-Zentrum Berlin für Materialien und Energie
Maytal Caspary Toroker: Technion—Israel Institute of Technology
Shannon W. Boettcher: University of Oregon

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Fe-containing transition-metal (oxy)hydroxides are highly active oxygen-evolution reaction (OER) electrocatalysts in alkaline media and ubiquitously form across many materials systems. The complexity and dynamics of the Fe sites within the (oxy)hydroxide have slowed understanding of how and where the Fe-based active sites form—information critical for designing catalysts and electrolytes with higher activity and stability. We show that where/how Fe species in the electrolyte incorporate into host Ni or Co (oxy)hydroxides depends on the electrochemical history and structural properties of the host material. Substantially less Fe is incorporated from Fe-spiked electrolyte into Ni (oxy)hydroxide at anodic potentials, past the nominally Ni2+/3+ redox wave, compared to during potential cycling. The Fe adsorbed under constant anodic potentials leads to impressively high per-Fe OER turn-over frequency (TOFFe) of ~40 s−1 at 350 mV overpotential which we attribute to under-coordinated “surface” Fe. By systematically controlling the concentration of surface Fe, we find TOFFe increases linearly with the Fe concentration. This suggests a changing OER mechanism with increased Fe concentration, consistent with a mechanism involving cooperative Fe sites in FeOx clusters.

Date: 2023
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DOI: 10.1038/s41467-023-43305-z

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