Angewandte Chemie International Edition · 2019 · 117 citations · 37 references
Natural SciencesChemistryMaterials ScienceElectrochemistryNanomaterialsNanotechnologyCarbon NanomaterialsElectrode MaterialsNanocatalysisNanocompositesNanomaterial CharacterizationNanomaterials SynthesisCatalytic ActivityCatalytic NanoparticlesElectrocatalysisElectrocatalytic NanomaterialsMetal-organic Framework CatalystsOxygen Evolution CatalystsOxygen Evolution ReactionTurnover Frequency
Abstract Determination of the intrinsic electrocatalytic activity of nanomaterials by means of macroelectrode techniques is compromised by ensemble and film effects. Here, a unique “particle on a stick” approach is used to grow a single metal–organic framework (MOF; ZIF‐67) nanoparticle on a nanoelectrode surface which is pyrolyzed to generate a cobalt/nitrogen‐doped carbon (CoN/C) composite nanoparticle that exhibits very high catalytic activity towards the oxygen evolution reaction (OER) with a current density of up to 230 mA cm −2 at 1.77 V (vs. RHE), and a high turnover frequency (TOF) of 29.7 s −1 at 540 mV overpotential. Identical location transmission electron microscopy (IL‐TEM) analysis substantiates the “self‐sacrificial” template nature of the MOF, while post‐electrocatalysis studies reveal agglomeration of Co centers within the CoN/C composite during the OER. “Single‐entity” electrochemical analysis allows for deriving the intrinsic electrocatalytic activity and furnishes insight into the transient behavior of the electrocatalyst under reaction conditions.
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