Simple route for gram synthesis of less defective few layered graphene and its electrochemical performance

Title
Simple route for gram synthesis of less defective few layered graphene and its electrochemical performance
Author(s)
조무환나지쉬파르빈모드안사리
Keywords
EXFOLIATED GRAPHENE; GRAPHITE; SUPERCAPACITORS; SHEETS; FABRICATION; COMPOSITES; ELECTRODES; NANOSHEETS; THICKNESS; CATALYST
Issue Date
201505
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v.5, no.56, pp.44920 - 44927
Abstract
The mass production of high-quality graphene (GN) sheets is essential for their practical applications on a large scale. This paper reports a simple and less corrosive technique for the electrochemical exfoliation of graphite sheets using an aqueous solution mixture of sodium hydroxide, sodium thiosulfate, and sodium hypochlorite (NaOH + Na2S2O3 + NaClO4) as an electrolyte. The presence of NaClO4 expanded the graphite lattice. NaOH in the electrolyte facilitated the electrochemical reduction of the preformed oxygen functional groups on GN while the sulphate ions of Na2S2O3 accelerated the exfoliation of the graphite sheet. Along a series of chemical reactions, the oxidation process produced O-2 and SO2 gases. These gases exerted additional forces on the graphite layers and separated the loosely bonded graphite layers, thereby accelerating the exfoliation process. The methodology produces large quantities of crystalline and high quality GN with few layered structures, and was thus called as few layered graphene (FLGN). The prepared FLGN was characterized using a range of techniques, including Raman spectroscopy and atomic force microscopy, which showed that the as-prepared FLGN has 4-6 layers and a large lateral size, which was also confirmed by other analysis. The electrochemical properties of FLGN were examined by cyclic voltammetry, impedance spectroscopy and charge/discharge studies. The as-prepared FLGN exhibited a high specific capacity and good cyclic stability, which makes this methodology promising for the large scale production of FLGN for practical applications.
URI
http://hdl.handle.net/YU.REPOSITORY/32298http://dx.doi.org/10.1039/c5ra06404j
ISSN
2046-2069
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공과대학 > 화학공학부 > Articles
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