Spontaneous formation of core-shell silver-copper oxide by carbon dot-mediated reduction for enhanced oxygen electrocatalysis

Water-soluble carbon dots (CDs) were successfully synthesized by a simple electrochemical technique and used as a clean, green reductive agent to prepare core-shell, silver-copper oxide (Ag@CuO) nanoparticles under organic ligand-free conditions. In a typical procedure, ethanol was used as a source...

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Bibliographic Details
Published in:Electrochimica acta 2020-01, Vol.329, p.135172, Article 135172
Main Authors: Im, Hoseop, Noh, Sunguk, Shim, Jun Ho
Format: Article
Language:English
Subjects:
Carbon
Carbon dots
Copper
Copper oxides
Core-shell Ag@CuO
Core-shell structure
Electrochemical carbonization
Electrons
Ethanol
Nanoparticles
Oxidation
Oxygen reduction reaction
Oxygen reduction reactions
Photoelectrons
Silver
Spectrum analysis
Valence
X ray photoelectron spectroscopy
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Summary:Water-soluble carbon dots (CDs) were successfully synthesized by a simple electrochemical technique and used as a clean, green reductive agent to prepare core-shell, silver-copper oxide (Ag@CuO) nanoparticles under organic ligand-free conditions. In a typical procedure, ethanol was used as a source of carbon to produce CDs in alkaline media. Surfactant-free Ag@CuO nanostructure was spontaneously formed by spontaneous redox reaction between Ag+/Cu2+ and CDs. Physicochemical characterization by X-ray diffraction, UV–Vis spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy identified the presence of core-shell structures and of Cu in oxidation state II. For comparison purposes, Ag and CuO nanoparticles were prepared in the same manner. A detailed electrochemical investigation revealed that enhanced oxygen reduction reaction (ORR) was synergistically achieved using the Ag@CuO nanoparticles, which greatly accelerated the electrochemical reduction of intermediate peroxide (HO2−) during ORR. Oxygen electrocatalysis is facilitated by the synergistic effects of the Ag core and the CuO shell, which greatly accelerates the electrocatalytic reductions of intermediate species during ORR. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.135172