Dual Role of Silver Moieties Coupled with Ordered Mesoporous Cobalt Oxide towards Electrocatalytic Oxygen Evolution Reaction

Herein, we show that the performance of mesostructured cobalt oxide electrocatalyst for oxygen evolution reaction (OER) can be significantly enhanced by coupling of silver species. Various analysis techniques including pair distribution function and Rietveld refinement, X‐ray absorption spectroscopy...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-09, Vol.59 (38), p.16544-16552
Main Authors: Yu, Mingquan, Moon, Gun‐hee, Castillo, Rebeca G., DeBeer, Serena, Weidenthaler, Claudia, Tüysüz, Harun
Format: Article
Language:English
Subjects:
Absorption spectroscopy
activation
Ag2O nanoclusters
Charge transfer
Cobalt
Cobalt oxides
Distribution functions
Electrocatalysts
Electron microscopy
Geographical distribution
Impurities
iron incorporation
Nanoclusters
ordered mesoporous Co3O4
Oxygen
oxygen evolution reaction
Oxygen evolution reactions
Silver
Spices
Synchrotrons
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Summary:Herein, we show that the performance of mesostructured cobalt oxide electrocatalyst for oxygen evolution reaction (OER) can be significantly enhanced by coupling of silver species. Various analysis techniques including pair distribution function and Rietveld refinement, X‐ray absorption spectroscopy at synchrotron as well as advanced electron microscopy revealed that silver exists as metallic Ag particles and well‐dispersed Ag2O nanoclusters within the mesostructure. The benefits of this synergy are twofold for OER: highly conductive metallic Ag improves the charge transfer ability of the electrocatalysts while ultra‐small Ag2O clusters provide the centers that can uptake Fe impurities from KOH electrolyte and boost the catalytic efficiency of Co–Ag oxides. The current density of mesostructured Co3O4 at 1.7 VRHE is increased from 102 to 211 mA cm−2 with incorporation of silver spices. This work presents the dual role of silver moieties and demonstrates a simple method to increase the OER activity of Co3O4. One stone, two birds: The twofold advantages of silver coupling with ordered mesoporous Co3O4 for OER are demonstrated. Metallic silver enhances the conductivity of the structure while Ag2O nanoclusters provide centers for Fe uptake from the KOH electrolyte and boost significantly the efficiency of the electrocatalyst.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202003801