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Article Dans Une Revue Nature Communications Année : 2021

Spin pinning effect to reconstructed oxyhydroxide layer on ferromagnetic oxides for enhanced water oxidation

Tianze Wu
Yuanmiao Sun
  • Fonction : Auteur
Shengnan Sun
  • Fonction : Auteur
Guoyu Xian
  • Fonction : Auteur
Günther Scherer
Joel Ager
Alexis Grimaud
Chengmin Shen
  • Fonction : Auteur
Jose Gracia
Hong-Jun Gao

Résumé

Abstract Producing hydrogen by water electrolysis suffers from the kinetic barriers in the oxygen evolution reaction (OER) that limits the overall efficiency. With spin-dependent kinetics in OER, to manipulate the spin ordering of ferromagnetic OER catalysts (e.g., by magnetization) can reduce the kinetic barrier. However, most active OER catalysts are not ferromagnetic, which makes the spin manipulation challenging. In this work, we report a strategy with spin pinning effect to make the spins in paramagnetic oxyhydroxides more aligned for higher intrinsic OER activity. The spin pinning effect is established in oxide FM /oxyhydroxide interface which is realized by a controlled surface reconstruction of ferromagnetic oxides. Under spin pinning, simple magnetization further increases the spin alignment and thus the OER activity, which validates the spin effect in rate-limiting OER step. The spin polarization in OER highly relies on oxyl radicals (O∙) created by 1 st dehydrogenation to reduce the barrier for subsequent O-O coupling.

Domaines

Matériaux
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Dates et versions

hal-04104677 , version 1 (24-05-2023)

Identifiants

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Tianze Wu, Xiao Ren, Yuanmiao Sun, Shengnan Sun, Guoyu Xian, et al.. Spin pinning effect to reconstructed oxyhydroxide layer on ferromagnetic oxides for enhanced water oxidation. Nature Communications, 2021, 12 (1), pp.3634. ⟨10.1038/s41467-021-23896-1⟩. ⟨hal-04104677⟩
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