Details

Autor(en) / Beteiligte

• Wu, Tianze
• Ren, Xiao
• Sun, Yuanmiao
• Sun, Shengnan
• Xian, Guoyu
• Scherer, Günther G.
• Fisher, Adrian C.
• Mandler, Daniel
• Ager, Joel W.
• Grimaud, Alexis
• Wang, Junling
• Shen, Chengmin
• Yang, Haitao
• Gracia, Jose
• Gao, Hong-Jun
• Xu, Zhichuan J.

Titel

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

Ist Teil von

• Nature communications, 2021-06, Vol.12 (1), p.3634-3634, Article 3634

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. Water oxidation to triplet oxygen requires a spin polarization process for faster kinetics. Here, the authors show an interface spin pinning effect between ferromagnetic oxides and reconstructed oxyhydroxide surface layer, where the spin ordering in paramagnetic oxyhydroxide catalyst layer can be tuned to improve the intrinsic activity.