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Physical and Electrochemical Properties of Graphene Decorated with ZnO Hollow Spheres for Supercapacitor Applications

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Abstract:

Single-layer graphene-ZnO hollow sphere (SLG-ZnO(HS)) composites were successfully prepared through facile one-step solvothermal synthesis route. The morphological structures of the samples were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Hollow spheres consisting of ZnO nanoparticles with a diameter of approximately 30 nm are decorated to both sides of the SLG sheets. The electrochemical performances were tested by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance (EIS). The SLG-ZnO(HS) composite electrode synthesized at a concentration of 0.25 mM Zn precursor exhibited an enhanced specific capacitance of 34.7 F/g at a scan rate of 1 mV/s with energy and power densities of 5.39 W h/kg and 1.73 kW/kg, respectively.

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Periodical:

Key Engineering Materials (Volume 908)

Pages:

284-292

DOI:

https://doi.org/10.4028/p-759prg

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Online since:

January 2022

Authors:

Abqari Luthfi Albert Abdullah*, Shahidan Radiman, Muhammad Azmi Abdul Hamid, Mohamad Faizal Yusman Mohd Hanappi

Keywords:

Graphene, Hollow Sphere, Solvothermal, Supercapacitors, Zinc Oxide

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© 2022 Trans Tech Publications Ltd. All Rights Reserved

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