Spin Pinning Effect to Reconstructed Oxyhydroxide Layer on Ferromagnetic Oxides for Enhanced Water Oxidation

Overview

Journal Nat Commun

Specialty Biology

Date 2021 Jun 16

PMID 34131143

Citations 27

Authors

Tianze Wu

Xiao Ren

Yuanmiao Sun

Shengnan Sun

Guoyu Xian

Gunther G Scherer

Adrian C Fisher

Daniel Mandler

Joel W Ager

Alexis Grimaud

Junling Wang

Chengmin Shen

Haitao Yang

Jose Gracia

Hong-Jun Gao

Zhichuan J Xu

Affiliations

Soon will be listed here.

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/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 dehydrogenation to reduce the barrier for subsequent O-O coupling.

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