Angewandte Chemie International Edition · 2017 · 190 citations · 58 references
Natural SciencesChemical EngineeringChemistryCatalysisElectrochemical EngineeringElectrochemistryCatalyst DesignCatalytic MechanismsElectrode MaterialsRedox CatalysisRedox-active MaterialsWater OxidationElectrocatalystsElectrocatalytic Oxygen EvolutionElectrocatalytic Water OxidationMetal Oxide Oxygen Evolution CatalystsMetal-organic Framework CatalystsOxygen Evolution CatalystsOxygen Evolution ReactionTurnover Frequency
Abstract Keggin‐type polyoxometalate anions [XM 12 O 40 ] n − are versatile, as their applications in interdisciplinary areas show. The Keggin anion [CoW 12 O 40 ] 6− turns into an efficient and robust electrocatalyst upon its confinement in the well‐defined void space of ZIF‐8, a metal–organic framework (MOF). [H 6 CoW 12 O 40 ]@ZIF‐8 is so stable to water oxidation that it retains its initial activity even after 1000 catalytic cycles. The catalyst has a turnover frequency (TOF) of 10.8 mol O 2 (mol Co) −1 s −1 , one of the highest TOFs for electrocatalytic oxygen evolution at neutral pH. Controlled experiments rule out the chances of formation and participation of CoO x in this electrocatalyic water oxidation.
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