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- W3191657106 abstract "Identifying real active sites and understanding the mechanism of oxygen evolution reaction (OER) are still a big challenge today for developing efficient electrochemical catalysts in renewable energy technologies. Here, using a combined in situ/operando experiments and theory, the catalytic mechanism of the ordered OER active Co and Ir ions in Sr2CoIrO6−δ is studied, which exhibits an unprecedented low overpotential 210 mV to achieve 10 mA cm–2, ranking the highest performance among perovskite-based solid-state catalysts. Operando X-ray absorption spectroscopies as a function of applied voltage indicates that Ir4+ ion is gradually converted into extremely high-valence Ir5+/6+, while the part of Co3+ ion is transferred into Co4+ under OER process. Density functional theory calculations explicitly reveal the order Co-O-Ir network as an origin of ultrahigh OER activity. The work opens a promising path to overcome the sluggish kinetics of OER bottleneck for water splitting via proper arrangements of the multi-active sites in catalyst." @default.
- W3191657106 created "2021-08-16" @default.
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- W3191657106 date "2021-08-03" @default.
- W3191657106 modified "2023-10-16" @default.
- W3191657106 title "In Situ/Operando Capturing Unusual Ir <sup>6+</sup> Facilitating Ultrafast Electrocatalytic Water Oxidation" @default.
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- W3191657106 doi "https://doi.org/10.1002/adfm.202104746" @default.
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