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Oxygen evolution reaction (OER) with intractable high overpotential is therate-limiting step for rechargeable metal-air battery, water electrolysissystems, and solar fuels devices. There exists a spin state transition fromspin singlet OH-/H2O reactant to spin triplet O2 product, which has notreceived enough attention yet. In this perspective, we attempt to retrospectelectron behaviours during the whole OER process, with the consideration ofspin attribute. Regardless of the adopted mechanisms by differentelectrocatalysts, for example, adsorbate evolution mechanism (AEM) or latticeoxygen mechanism (LOM), the underlying rationale is that active sites have toextract three in four electrons with the same spin direction before theformation of O=O. This spin-sensitive nature of OER superimposes additionalhigh requirements on the electrocatalysts, especially on the spin structure, tocompliment the fast electron transfer in the interface with spin selection andsmoothly delivery afterwards. When optimizing the geometric and electronicstructures catering for the spin-sensitive OER, awareness of the couplingsbetween spin, charge, orbital and lattice is necessary. Some spin-correlatedphysical properties, such as (1) crystal field, (2) coordination, (3)oxidation, (4) bonding, (5) eg electron number, (6) conductivity and (7)magnetism, are also discussed briefly. It is hoped that our perspective couldshed lights on the underlying physics of the slow kinetics of OER, providing arational guidance for more effective energy conversion electrocatalystsdesigns.

Understanding the mechanism of oxygen evolution reaction (OER) with the consideration of spin