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Preparation and Capacitance Properties of Graphene Quantum Dot/NiFe−Layered Double‐Hydroxide Nanocomposite
Author(s) -
Samuei Sara,
Rezvani Zolfaghar,
Shomali Ashkan,
Ülker Emine,
Karadaş Ferdi
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000838
Subject(s) - graphene , nanocomposite , supercapacitor , cyclic voltammetry , dielectric spectroscopy , capacitance , thermogravimetric analysis , quantum dot , chemistry , fourier transform infrared spectroscopy , scanning electron microscope , chemical engineering , coprecipitation , materials science , nanotechnology , electrochemistry , inorganic chemistry , composite material , electrode , organic chemistry , engineering
A new composite from graphene quantum dots (GQDs) and NiFe layered double hydroxide was successfully prepared by the coprecipitation method under optimal conditions. The nanoparticles of the composite were analyzed by X‐ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA) to obtain the structure, composition and morphology information. Also, the electrochemical properties were investigated by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The nanocomposite displays a specific capacitance of 712.7 F g −1 and excellent cycle life after 2500 cycles by applying 10 A g −1 of the current density in 1 M KOH electrolyte, which confirms that the nanocomposite has superb capacitance retention (∼94.8 %) and can be used as a capable supercapacitor. Furthermore, this study provides a desirable procedure for the preparation of novel nanocomposites based on graphene quantum dots, which can be used in energy storage/conversion devices.