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Size-dependent charge storage of graphene flakes

K. F., Chong and C. Chan, Geraldine S. and Ali, Gomaa A. M. and Eunice Tang, Danella and Algarni, H. (2018) Size-dependent charge storage of graphene flakes. In: 4th Nanomaterials for Energy and Environment 2018, 27 - 29 Jun 2018 , Paris, France. pp. 1-20.. (Unpublished)

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Abstract

This paper focuses on the charge storage properties of reduced graphene oxide (rGO) in different flake sizes. Sonication is used to exfoliate rGO into different flake sizes, as confirmed by the spectroscopy and microscopy techniques. The oxygen-related functionalities on rGO samples are quantified by Fourier transform infrared spectroscopy and reveal that higher amount of unreduced oxygen functionalities can be found on rGO with smaller flake size. The charge storage properties of rGO in different flake sizes are studied by cyclic voltammetry, galvanostatic charge discharge and electrochemical impedance spectroscopy. The findings demonstrate that the rGO with smaller flake size possesses higher charge storage capability (238 F g-1 at x A g-1), as compared to that of rGO with larger flake size (147 F g-1 at x A g-1). Apart from larger surface area contribution, the unreduced oxygen functionalities in rGO with smaller flake size also plays an important role in contributing pseudocapacitance effect to the rGO. The current findings add substantial understanding of rGO flake size effect towards electrochemical properties.

Item Type: Conference or Workshop Item (Speech)
Uncontrolled Keywords: Carbon; Exfoliation; Pseudocapacitance; Supercapacitor; Double layer capacitance
Subjects: Q Science > QD Chemistry
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Pn. Hazlinda Abd Rahman
Date Deposited: 21 Sep 2018 07:14
Last Modified: 21 Sep 2018 07:14
URI: http://umpir.ump.edu.my/id/eprint/21996
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