过电位
析氧
反铁磁性
化学
自旋(空气动力学)
自旋态
凝聚态物理
电子转移
电子
自旋极化
铁磁性
密度泛函理论
化学物理
物理
物理化学
计算化学
电极
量子力学
热力学
电化学
作者
Xinwei Guan,Mingyue Wang,Zezhi Chen,Chaojie Cao,Zhixuan Li,Ruichang Xue,Yang Fu,Bernt Johannessen,Anton Tadich,Jiabao Yi,Hua Fan,Nana Wang,Baohua Jia,Xiaoning Li,Tianyi Ma
标识
DOI:10.1002/anie.202415797
摘要
Oxygen evolution and reduction reactions (OER and ORR) play crucial roles in energy conversion processes such as water splitting and air batteries, where spin dynamics inherently influence their efficiency. However, the specific contribution of spin has yet to be fully understood. In this study, we intentionally introduce a spin channel through the transformation of trigonal antiferromagnetic SrCoO2.5 into cubic ferromagnetic SrCoO3, aiming to deepen our understanding of spin dynamics in catalytic reactions. Based on the results from spherical‐aberration‐corrected microscope, synchrotron absorption spectra, magnetic characterizations, and density functional theory calculations, it is revealed that surface electron transfer is predominantly governed by local geometric structures, while the presence of the spin channel significantly enhances the bulk transport of spin‐polarized electrons, particularly under high current densities where surface electron transfer is no longer the limiting factor. The overpotential for OER is reduced by at least 70 mV at 150 mA cm‐2 due to the enhanced conductivity from spin‐polarized electrons facilitated by spin channels, with an expectation of even more significant reductions at higher current densities. This work provides a clearer picture of the role of spin in oxygen‐involved electrocatalysis, providing critical insights for the design of more efficient catalytic systems in practical applications.
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