Work

Preparation and Capacitance Properties of Graphene Quantum Dot/NiFe−Layered Double‐Hydroxide Nanocomposite

Year: 2020

Type: article

Abstract: 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.

Source: European Journal of Inorganic Chemistry

DOI: 10.1002/ejic.202000838

Authors: Sara Samuei, Zolfaghar Rezvani, Ashkan Shomali, Emine Ülker, Ferdi Karadaş

Institutions: Azarbaijan Shahid Madani University, Recep Tayyip Erdoğan University, Bilkent University

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funder: Azarbaijan Shahid Madani University