Facile Synthesis of Mesoporous Co3O4/CoO on rGO Nanocomposites as Highly Active and Stable Oxygen Bi-Functional Electrocatalysts
authors Abidat, I; Ferreira, P; Napporn, TW; Rousseau, J; Guignard, N; Canaff, C; Morais, C; Habrioux, A; Kokoh, KB
nationality International
journal JOURNAL OF THE ELECTROCHEMICAL SOCIETY
keywords GRAPHENE OXIDE; RAMAN-SPECTRA; EVOLUTION REACTION; COBALT OXIDE; REDUCTION; METAL; HYBRID; CATALYSTS; SPECTROSCOPY; FILMS
abstract Mesoporous Co(3)O(4)mixed CoO onto reduced graphene oxide (rGO) nanocomposites were obtained by an easy surfactant-free synthesis using urea as hydrolyzing agent. This route enabled nanomaterials presenting tuned morphology, surface composition and oxide-rGO interactions as revealed by the different characterization techniques. Indeed, nanostructures varied from broom-like, chrysanthemum-like to micro-sized sheet-like morphologies. The amount of Co(3)O(4)phase was shown to be gradually rising as the urea amount increases being always higher at the surface than in the bulk. Different oxide-rGO interactions have also been demonstrated, suggesting that high amounts of urea cause a decrease in the size of the nanoparticles and limit their superposition. The catalysts prepared at high urea concentrations showed more exposed electroactive surface and enhanced activity as bifunctional oxygen electrocatalysts. Furthermore, the most active nanocomposite exhibited remarkable stability, making it a very promising candidate for the elaboration of a stable and truly reversible air electrode in alkaline media.
publisher ELECTROCHEMICAL SOC INC
issn 0013-4651
isbn 1945-7111
year published 2020
volume 167
issue 13
digital object identifier (doi) 10.1149/1945-7111/abb8b4
web of science category Electrochemistry; Materials Science, Coatings & Films
subject category Electrochemistry; Materials Science
unique article identifier WOS:000576084600001
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  impact metrics
journal analysis (jcr 2019):
journal impact factor 3.721
5 year journal impact factor 3.719
category normalized journal impact factor percentile 67.989
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