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

Tianze Wu, Xiao Ren, Yuanmiao Sun, Shengnan Sun, Guoyu Xian, Günther G. Scherer, Adrian C. Fisher, Daniel Mandler, Joel W. Ager, Alexis Grimaud, Junling Wang, Chengmin Shen, Haitao Yang (), Jose Gracia, Hong-Jun Gao and Zhichuan J. Xu ()
Additional contact information
Tianze Wu: Nanyang Technological University
Xiao Ren: Nanyang Technological University
Yuanmiao Sun: Nanyang Technological University
Shengnan Sun: Nanyang Technological University
Guoyu Xian: Chinese Academy of Science
Adrian C. Fisher: University of Cambridge
Daniel Mandler: The Hebrew University of Jerusalem
Joel W. Ager: University of California at Berkeley
Alexis Grimaud: Chimie du Solide et de l’Energie, UMR 8260, Collège de France
Junling Wang: Nanyang Technological University
Chengmin Shen: Chinese Academy of Science
Haitao Yang: Chinese Academy of Science
Jose Gracia: MagnetoCat SL, General Polavieja 9 3I
Hong-Jun Gao: Chinese Academy of Science
Zhichuan J. Xu: Nanyang Technological University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: 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 oxideFM/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 1st dehydrogenation to reduce the barrier for subsequent O-O coupling.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23896-1

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DOI: 10.1038/s41467-021-23896-1

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