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• W2783195092 startingPage "1783" @default.
• W2783195092 abstract "Seeking for active MnOx material as artificial water splitting catalyst has been a long history since the discovery of PSII system in nature. To date, the highest activity MnOx catalyst reported for oxygen evolution reaction (OER) does however not belong to common MnO2 polymorphs (α-, β-, δ-MnO2), but rather to nascent δ-MnO2 layer produced in situ from spinel under electrochemical conditions with unknown active site structure. Here with the stochastic surface walking (SSW) pathway sampling method, we for the first time resolve the atomic-level mechanism of spinel-to-layer Mn3O4 solid phase transition in aqueous electrolyte. We show that a transient H0.5MnO2 phase is the precursor of transition that forms at high voltage (>1 V), and it undergoes the solid-to-solid phase transition to produce a δ-MnO2 layer, which is accompanied by Mn dissolution, dislocation, layer-breaking, and insertion of water/cations between layers. This leads to the generation of a variety of possible defective structures. We demonstrate using first-principles calculations that a special edge site with neighboring Mn vacancy provides the best OER activity with an overpotential of 0.59 V, 0.19 V lower than that of pristine MnO2. The high activity of such Mn sites are attributed to its special local structure: pseudocubane with one corner missing. The presence of the Mn vacancy near the active site enhances the adsorption of OH intermediate in OER. This defective cubane structure shares the common geometrical and electronic features found in the PSII system." @default.
• W2783195092 created "2018-01-26" @default.
• W2783195092 creator A5023502514 @default.
• W2783195092 creator A5091396785 @default.
• W2783195092 date "2018-01-26" @default.
• W2783195092 modified "2023-10-16" @default.
• W2783195092 title "Active Site Revealed for Water Oxidation on Electrochemically Induced δ<i>-</i>MnO₂: Role of Spinel-to-Layer Phase Transition" @default.
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• W2783195092 doi "https://doi.org/10.1021/jacs.7b11393" @default.
• W2783195092 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29333857" @default.
• W2783195092 hasPublicationYear "2018" @default.
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