Role of Lattice Oxygen in the Oxygen Evolution Reaction on Co3O4: Isotope Exchange Determined Using a Small-Volume Differential Electrochemical Mass Spectrometry Cell Design

This work demonstrates the role of lattice oxygen of metal oxide catalysts in the oxygen evolution reaction (OER) as evidenced by isotope labeling together with the differential electrochemical mass spectrometry (DEMS) method. Our recent report assessed this role for Co3O4 using a flow-through DEMS...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2019-10, Vol.91 (20), p.12653-12660
Main Authors: Amin, Hatem M. A, Königshoven, Peter, Hegemann, Martina, Baltruschat, Helmut
Format: Article
Language:English
Subjects:
Ball models
Capacitance
Catalysts
Chemistry
Cobalt oxides
Delay time
Electrochemistry
Electrolytes
Evolution
Exchanging
Gas evolution
Mass spectrometry
Mass spectroscopy
Oxygen
Oxygen evolution reactions
Scientific imaging
Spectroscopy
Surface area
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Summary:This work demonstrates the role of lattice oxygen of metal oxide catalysts in the oxygen evolution reaction (OER) as evidenced by isotope labeling together with the differential electrochemical mass spectrometry (DEMS) method. Our recent report assessed this role for Co3O4 using a flow-through DEMS cell, which requires a large volume of electrolyte. Herein, we extend this procedure to different Co3O4 catalyst loadings and particle sizes as well as the mixed Ag + Co3O4 catalyst. We introduce, for the first time, a novel small-volume DEMS cell design capable of using disc electrodes and only
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.9b01749